Oral Pathology - Neoplasia Quiz With MCQ Questions

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Oral Pathology Quizzes & Trivia

Oral pathology - Neoplasia


Questions and Answers
  • 1. 

    The study of tumors is called

    • A.

      Pathology

    • B.

      Neoplasia

    • C.

      Cytology

    • D.

      Oncology

    Correct Answer
    D. Oncology
    Explanation
    Oncology is the study of tumors and cancer. It focuses on the diagnosis, treatment, and prevention of cancer. This field involves research, medical procedures, and the development of new therapies to combat cancer. Oncologists are medical professionals who specialize in the treatment of cancer patients. They work closely with other healthcare providers to provide comprehensive care to individuals with cancer.

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  • 2. 

    Neoplasia involves

    • A.

      An irreversible change that results in an uncontrolled multiplication of cells

    • B.

      An abnormal proliferation of cell in response to tissue damage

    • C.

      A controlled proliferation of cells

    • D.

      A normal arrangement of proliferating cells

    Correct Answer
    A. An irreversible change that results in an uncontrolled multiplication of cells
    Explanation
    Neoplasia refers to the development of a tumor or abnormal growth. It involves an irreversible change in cells, where they start multiplying uncontrollably. This uncontrolled multiplication leads to the formation of a mass or tumor, which can be cancerous or non-cancerous. The cells in neoplasia lose their normal growth control mechanisms, resulting in the uncontrolled growth and division of cells.

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  • 3. 

    Viruses that cause neoplastic transformation of cells are called

    • A.

      Tranformation viruses

    • B.

      Oncogenic

    • C.

      Pathogenic viruses

    • D.

      Opportunistic

    Correct Answer
    B. Oncogenic
    Explanation
    Viruses that cause neoplastic transformation of cells are called oncogenic viruses. These viruses have the ability to alter the genetic material of host cells, leading to uncontrolled cell growth and the development of tumors. Oncogenic viruses can integrate their genetic material into the host cell's DNA, disrupting normal cellular processes and promoting the formation of cancerous cells. Examples of oncogenic viruses include human papillomavirus (HPV), hepatitis B virus (HBV), and Epstein-Barr virus (EBV). These viruses are known to be directly involved in the development of certain types of cancer.

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  • 4. 

    Which one of the following is a characteristic of benign tumors?

    • A.

      Numerous mitotic figures

    • B.

      Rapid growth

    • C.

      Slow growth

    • D.

      Metastasis

    Correct Answer
    C. Slow growth
    Explanation
    Benign tumors are characterized by slow growth. Unlike malignant tumors, which grow rapidly, benign tumors tend to grow at a slower pace. This is because benign tumors do not invade surrounding tissues or spread to other parts of the body (metastasis). While they may still cause health issues depending on their location and size, the slow growth of benign tumors is a key characteristic that distinguishes them from malignant tumors.

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  • 5. 

    A small exophytic lesion of the tongue that is the color of normal mucosa and is composed of papillary projectionsarranged in a cauliflower loke appearanceis most likely a

    • A.

      Papilloma

    • B.

      Fibroma

    • C.

      Neurofibroma

    • D.

      Verrucous carcinoma

    Correct Answer
    A. Papilloma
    Explanation
    A small exophytic lesion of the tongue that is the color of normal mucosa and is composed of papillary projections arranged in a cauliflower-like appearance is most likely a papilloma. This is because papillomas are benign growths that commonly occur on the tongue and have a characteristic appearance with papillary projections. Fibromas are composed of fibrous tissue and do not typically have a cauliflower-like appearance. Neurofibromas are tumors that arise from nerve tissue and would not present with the described appearance. Verrucous carcinoma is a type of cancer that is characterized by a wart-like appearance and is unlikely to be the correct answer given the benign nature of the lesion described.

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  • 6. 

    Which of the following is a histologic characteric of squamous cell carcinoma?

    • A.

      Invasion of tumor cells into the connective tissue

    • B.

      Pleomorphic epithelial cells

    • C.

      Keratin pearls

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    All of the given options are histologic characteristics of squamous cell carcinoma. Squamous cell carcinoma is known for the invasion of tumor cells into the connective tissue, the presence of pleomorphic epithelial cells, and the formation of keratin pearls. Therefore, the correct answer is "all of the above."

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  • 7. 

    Which of the following are the most common locations for intraoral squamous cell carcinoma?

    • A.

      Upper labial mucosa buccal mucosa hard palate

    • B.

      Lower labial mucosa maxillary gingiva buccal mucosa

    • C.

      Floor of mouth ventrolateral tongue, soft palate

    • D.

      Anterior tongue, mandibular gingiva, retromolar area

    Correct Answer
    C. Floor of mouth ventrolateral tongue, soft palate
    Explanation
    Intraoral squamous cell carcinoma is a type of oral cancer that commonly occurs in certain locations within the mouth. The floor of the mouth, ventrolateral tongue, and soft palate are known to be the most common locations for this type of cancer. These areas have a higher likelihood of developing squamous cell carcinoma due to factors such as exposure to tobacco and alcohol, poor oral hygiene, and chronic irritation. It is important to be aware of these common locations in order to detect and diagnose oral cancer at an early stage.

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  • 8. 

    A histologic diagnosis of epithelial dysplasia is of concern because the lesion may

    • A.

      Cause sever bleeding

    • B.

      Be cosmetically objectionable

    • C.

      Be premalignant

    • D.

      Be hyperkeratosis

    Correct Answer
    C. Be premalignant
    Explanation
    The histologic diagnosis of epithelial dysplasia is concerning because it indicates abnormal changes in the epithelial cells, which can potentially progress to cancerous changes. This means that the lesion has the potential to become malignant or cancerous. It is important to closely monitor and possibly treat such lesions to prevent the development of cancer.

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  • 9. 

    Severe epithelial dysplasia may also be called

    • A.

      Epithelial hyperplasia

    • B.

      Carcinoma in situ

    • C.

      Infiltrating carcinoma

    • D.

      Hyperkeratosis

    Correct Answer
    B. Carcinoma in situ
    Explanation
    Severe epithelial dysplasia is a pre-cancerous condition where there are abnormal changes in the cells of the epithelium. This condition is often referred to as carcinoma in situ because it resembles cancer cells but has not yet invaded surrounding tissues. It is important to identify and treat severe epithelial dysplasia early to prevent the progression to invasive carcinoma. Epithelial hyperplasia, infiltrating carcinoma, and hyperkeratosis are different conditions that are not synonymous with severe epithelial dysplasia or carcinoma in situ.

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  • 10. 

    The most appropriate treatment for epithelial dysplasia is

    • A.

      Observation

    • B.

      Chemotherapy

    • C.

      Radiation therapy

    • D.

      Complete removal

    Correct Answer
    D. Complete removal
    Explanation
    Epithelial dysplasia refers to abnormal changes in the cells of epithelial tissue, which can lead to the development of cancer. The most appropriate treatment for epithelial dysplasia is complete removal, as it ensures that all the abnormal cells are eliminated, reducing the risk of progression to cancer. Observation alone may not be sufficient as it does not address the underlying issue, while chemotherapy and radiation therapy may be used in certain cases, but complete removal is the most effective treatment option.

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  • 11. 

    Verucous carcinoma is differtiated from another squamous cell carcinomas because it

    • A.

      Does not occur in the oral cavity

    • B.

      Most commonly occurs on the lower lip

    • C.

      Has a better prognosis

    • D.

      Has no keratin

    Correct Answer
    C. Has a better prognosis
    Explanation
    Verucous carcinoma is differentiated from other squamous cell carcinomas because it has a better prognosis. Prognosis refers to the likely course and outcome of a disease, and a better prognosis means that the disease is less aggressive and has a higher chance of successful treatment and survival. In the case of verucous carcinoma, it is known to have a slower growth rate, a lower likelihood of metastasis (spreading to other parts of the body), and a higher overall survival rate compared to other squamous cell carcinomas.

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  • 12. 

    The most common intraoral location for salivary gland tumors is the

    • A.

      Lower lip

    • B.

      Buccal mucosa

    • C.

      Palate

    • D.

      Anterior tongue

    Correct Answer
    C. Palate
    Explanation
    Salivary gland tumors can occur in various locations within the oral cavity, but the most common intraoral location is the palate. The palate is the roof of the mouth, and it contains minor salivary glands that can develop tumors. These tumors can be benign or malignant and may present as painless masses or ulcers. The high prevalence of salivary gland tumors in the palate is likely due to the large number of minor salivary glands present in this area.

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  • 13. 

    Which of the folowing is an example of a malignant salivary gland tumor?

    • A.

      Pleomorphic adenoma

    • B.

      Warthin's tumor

    • C.

      Monomorphic adenoma

    • D.

      Adenoid cystic carcinoma

    Correct Answer
    D. Adenoid cystic carcinoma
    Explanation
    Adenoid cystic carcinoma is an example of a malignant salivary gland tumor. This type of tumor is characterized by slow growth and the ability to invade nearby tissues and nerves. It is often difficult to completely remove surgically and has a high rate of recurrence. Adenoid cystic carcinoma is known for its tendency to spread along nerves, leading to pain and dysfunction. It can occur in various salivary glands, including the major and minor glands in the head and neck region.

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  • 14. 

    Which of the following statement about ameloblastomas are true? ameloblastomas

    • A.

      Are benign slow growing infiltrating tumors

    • B.

      Are composed of odontogenic epithelium

    • C.

      Most commonly occur in the mandibular molar ramus area

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    Ameloblastomas are benign slow-growing infiltrating tumors that are composed of odontogenic epithelium. They most commonly occur in the mandibular molar ramus area. Therefore, all of the statements about ameloblastomas are true.

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  • 15. 

    The odontogenic tumor that characcteristically presents as a well circumscribed radiolucency located in the anterior maxilla of an adolescent girl is an

    • A.

      Ameloblastic fibrtoma

    • B.

      Ameloblastoma

    • C.

      Odontogenic myxoma

    • D.

      Adenomatoid odontogenic tumor

    Correct Answer
    D. Adenomatoid odontogenic tumor
    Explanation
    The correct answer is adenomatoid odontogenic tumor. Adenomatoid odontogenic tumor is an odontogenic tumor that typically occurs in the anterior maxilla of adolescent girls. It is well-circumscribed and appears as a radiolucency on imaging. Ameloblastic fibroma, ameloblastoma, and odontogenic myxoma are other types of odontogenic tumors, but they do not present with the same characteristics as described in the question.

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  • 16. 

    The odontogenic tumor tha tmost resembles the mesenchyme of the dental follicle histologically is 

    • A.

      The cementifying fibroma

    • B.

      The odontogenic myxoma

    • C.

      The complex odontoma

    • D.

      The adenomatoid odontogenic tumor

    Correct Answer
    B. The odontogenic myxoma
    Explanation
    The odontogenic myxoma is the correct answer because histologically it closely resembles the mesenchyme of the dental follicle. This tumor is characterized by a loose myxoid stroma with scattered spindle-shaped cells. It is often associated with unerupted teeth and can cause expansion of the jawbone. The cementifying fibroma, complex odontoma, and adenomatoid odontogenic tumor have different histological features and do not resemble the dental follicle mesenchyme as closely as the odontogenic myxoma.

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  • 17. 

    A benign cementoblastoma can be recognized on xray film because  

    • A.

      It is well circumscribed radiopaque and attached to the root of the tooth

    • B.

      It has a charateristic multiocular radiolucent radiographic appearance

    • C.

      It radiograaphically resembles a periapical granuloma

    • D.

      It is a rapidly growing lesion

    Correct Answer
    A. It is well circumscribed radiopaque and attached to the root of the tooth
    Explanation
    A benign cementoblastoma can be recognized on an x-ray film because it is well circumscribed, meaning it has a clearly defined border. It is also radiopaque, meaning it appears as a white or light grey area on the x-ray film. Additionally, it is attached to the root of the tooth, which helps distinguish it from other lesions or abnormalities.

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  • 18. 

    Which one of the following lesions characteristically occurs on the gingiva? 

    • A.

      Peripheral ossifying fibroma

    • B.

      Periapical cemento-osseus dysplasia

    • C.

      Odontoma

    • D.

      Central ossifying fibroma

    Correct Answer
    A. Peripheral ossifying fibroma
    Explanation
    A peripheral ossifying fibroma is a benign tumor that typically occurs on the gingiva. It is a reactive lesion that arises from the periodontal ligament or the gingival connective tissue. It presents as a firm, pink, or red mass on the gingiva and can cause local discomfort or bleeding. It is most commonly seen in young adults and can be associated with poor oral hygiene. Treatment involves surgical excision of the lesion.

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  • 19. 

    Your patient a 48yr old black women present with multiple asymptomatic radiopaque massess on the mandible and maxilla.  there is no expansion of bone.  the most likely diagnosis is

    • A.

      Multiple odontomas

    • B.

      Cementifying fibromas

    • C.

      Periapical cement-osseous dysplasia

    • D.

      Florid cemento-osseuos dysplasia

    Correct Answer
    D. Florid cemento-osseuos dysplasia
    Explanation
    Florid cemento-osseous dysplasia is the most likely diagnosis in this case. This condition typically affects middle-aged black women and is characterized by multiple radiopaque masses on the mandible and maxilla. Unlike odontomas and cementifying fibromas, there is no expansion of the bone in florid cemento-osseous dysplasia. Additionally, periapical cement-osseous dysplasia usually presents as a single radiolucent lesion near the apex of a tooth, which is not consistent with the findings in this patient.

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  • 20. 

    A compound odontoma differs from a complex odontoma in that a compound odontoma

    • A.

      Is composed of tooth like structures

    • B.

      Has unlimited growth potential

    • C.

      Is primarily composed of dentla pulp tissue

    • D.

      Is usually located in the psoterior mandible

    Correct Answer
    A. Is composed of tooth like structures
    Explanation
    A compound odontoma is a type of odontoma that is composed of tooth-like structures. This means that it contains multiple small structures that resemble teeth. This is what sets it apart from a complex odontoma, which does not have these tooth-like structures. The presence of these structures is a characteristic feature of a compound odontoma.

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  • 21. 

    "peripheral" odontogenic tumors are located on the  

    • A.

      Tongue

    • B.

      Lower lip

    • C.

      Buccal mucosa

    • D.

      Gingiva

    Correct Answer
    D. Gingiva
    Explanation
    Peripheral odontogenic tumors are tumors that originate from the tissues surrounding the teeth. The term "peripheral" indicates that these tumors are located outside of the tooth structure itself. Among the given options, the gingiva refers to the gums surrounding the teeth, making it the correct answer for the location of peripheral odontogenic tumors.

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  • 22. 

    A benign tumor of adipose tissue is called a  

    • A.

      Lipoma

    • B.

      Schwannoma

    • C.

      Hemangioma

    • D.

      Lymphangioma

    Correct Answer
    A. Lipoma
    Explanation
    A benign tumor of adipose tissue is called a lipoma. Lipomas are non-cancerous growths that develop in the fatty tissue under the skin. They are usually soft to the touch and can occur anywhere on the body where fat is present. Lipomas are generally harmless and do not require treatment unless they cause discomfort or affect the appearance. Schwannomas are tumors that develop from the Schwann cells of the peripheral nerves, hemangiomas are abnormal growths of blood vessels, and lymphangiomas are tumors that form in the lymphatic system.

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  • 23. 

    The most common malignant soft tissue tumor of the head and neck in children is  

    • A.

      Squamous cell carcinoma

    • B.

      Malignant odontogenic tumor

    • C.

      Rhabdomyosarcoma

    • D.

      Osteosarcoma

    Correct Answer
    C. Rhabdomyosarcoma
    Explanation
    Rhabdomyosarcoma is the most common malignant soft tissue tumor in the head and neck region in children. It is a type of cancer that develops from skeletal muscle cells. This tumor is aggressive and can occur in various locations, including the head and neck area. It is more commonly seen in children than in adults. Squamous cell carcinoma, malignant odontogenic tumor, and osteosarcoma are all different types of tumors, but they are not as commonly found in the head and neck region of children as rhabdomyosarcoma.

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  • 24. 

    Malignant melanoma of the oral cavity is rare however the most common introoral location is the

    • A.

      Palate and maxillary gingiva

    • B.

      Tongue

    • C.

      Buccal mucosa

    • D.

      Retromolar area

    Correct Answer
    A. Palate and maxillary gingiva
    Explanation
    Malignant melanoma of the oral cavity is a rare condition. However, when it does occur, the most common locations within the oral cavity are the palate and maxillary gingiva. This means that if a person develops malignant melanoma in their oral cavity, it is more likely to be found in these areas compared to other locations such as the tongue, buccal mucosa, or retromolar area.

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  • 25. 

    Osteomas are a component of

    • A.

      Neurofibromatosis

    • B.

      Gardner syndrome

    • C.

      Osteosarcoma

    • D.

      Ossifying fibroma

    Correct Answer
    B. Gardner syndrome
    Explanation
    Gardner syndrome is a genetic disorder characterized by the development of multiple polyps in the colon and rectum, which can eventually lead to colorectal cancer. In addition to these gastrointestinal manifestations, Gardner syndrome can also present with other features including osteomas, which are benign bone tumors. Therefore, osteomas are a component or a characteristic feature of Gardner syndrome.

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  • 26. 

    A malignant tumor of boneforming tissue is called

    • A.

      Chondrosarcoma

    • B.

      Angiosarcoma

    • C.

      Osteosarcoma

    • D.

      Hemangiosarcoma

    Correct Answer
    C. Osteosarcoma
    Explanation
    Osteosarcoma is the correct answer because it refers to a malignant tumor that develops from bone-forming tissue. It is a type of bone cancer that primarily affects children and young adults. Osteosarcoma typically starts in the long bones of the arms or legs, but it can also occur in other bones. It is an aggressive cancer that often requires a combination of surgery, chemotherapy, and radiation therapy for treatment.

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  • 27. 

    A disorder characterised by an overproduction of atypical wbc is called

    • A.

      Hemangioma

    • B.

      Leukemia

    • C.

      Melanoma

    • D.

      Leukocytosis

    Correct Answer
    B. Leukemia
    Explanation
    Leukemia is a disorder characterized by the overproduction of atypical white blood cells (WBCs). This condition leads to an abnormal increase in the number of WBCs in the bloodstream. Hemangioma is a benign tumor made up of blood vessels, melanoma is a type of skin cancer, and leukocytosis refers to an elevated WBC count without specifying the abnormality in cell production. Therefore, leukemia is the correct answer as it specifically describes the overproduction of atypical WBCs.

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  • 28. 

    A malignant tumor of lymphocytes is called

    • A.

      Multiple myeloma

    • B.

      Melanoma

    • C.

      Lymphoma

    • D.

      Angiosarcoma

    Correct Answer
    C. Lymphoma
    Explanation
    A malignant tumor of lymphocytes is called lymphoma. Lymphoma is a type of cancer that affects the lymphatic system, which is a part of the body's immune system. It occurs when lymphocytes, a type of white blood cell, grow and multiply uncontrollably. Lymphoma can develop in various parts of the body, including the lymph nodes, bone marrow, and organs like the spleen and liver. It can present with symptoms such as swollen lymph nodes, fever, weight loss, and fatigue. Treatment options for lymphoma may include chemotherapy, radiation therapy, immunotherapy, and stem cell transplantation.

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  • 29. 

    The cell involved in multiplre myeloma is the

    • A.

      Lymphocyte

    • B.

      Macrophage

    • C.

      Rbc

    • D.

      Plasma cell

    Correct Answer
    D. Plasma cell
    Explanation
    The correct answer is plasma cell. Multiple myeloma is a type of cancer that affects plasma cells, which are a type of white blood cell responsible for producing antibodies. In multiple myeloma, abnormal plasma cells multiply uncontrollably in the bone marrow and interfere with the production of normal blood cells. This leads to symptoms such as bone pain, anemia, and increased susceptibility to infections. Therefore, the cell involved in multiple myeloma is the plasma cell.

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  • 30. 

    The most frequent introoral sit for metastatic tumors is

    • A.

      Buccal mucosa

    • B.

      Mandible

    • C.

      Soft palate

    • D.

      Floor of the mouth

    Correct Answer
    B. Mandible
    Explanation
    The mandible is the correct answer because it is the most common site for metastatic tumors in the oral cavity. Metastatic tumors are cancers that have spread from another part of the body to the oral cavity. The mandible, which is the lower jawbone, is a common site for metastasis due to its rich blood supply and proximity to other structures in the head and neck region. Tumors can easily spread to the mandible through the bloodstream or direct invasion from nearby structures.

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  • 31. 

    Which one of the following benign tumors is associated with von Recklinghausen disease?

    • A.

      Rhabdomyoma

    • B.

      Lipoma

    • C.

      Neurofibroma

    • D.

      Osteoma

    Correct Answer
    C. Neurofibroma
    Explanation
    Neurofibroma is a benign tumor that is commonly associated with von Recklinghausen disease, also known as neurofibromatosis type 1 (NF1). NF1 is a genetic disorder characterized by the development of multiple neurofibromas, which are tumors that originate from the cells that surround nerves. These tumors can occur anywhere in the body, including the skin, nerves, and other organs. Therefore, neurofibroma is the correct answer as it is specifically linked to von Recklinghausen disease.

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  • 32. 

    Which one of the following is the most common odontogenic tumor?

    • A.

      Odontoma

    • B.

      Ameloblastoma

    • C.

      Benign cementoblastoma

    • D.

      Odontogenic myxoma

    Correct Answer
    A. Odontoma
    Explanation
    Odontomas are the most common odontogenic tumors. They are benign tumors that arise from the cells involved in tooth development. Odontomas are composed of a mixture of dental tissues, including enamel, dentin, cementum, and pulp. They are typically asymptomatic and are often discovered incidentally on routine dental radiographs. Odontomas can be classified into two types: compound odontomas, which resemble miniature teeth, and complex odontomas, which have a disorganized mass of dental tissues. Treatment usually involves surgical removal of the tumor, although in some cases, monitoring may be sufficient.

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  • 33. 

    Which one of the following is the most common malignant salivery gland tumor in children?

    • A.

      Adenoid cystic carcinoma

    • B.

      Monomorphic adenoma

    • C.

      Papillary cystadenoma lymphomatosum

    • D.

      Mucoepidermoid carcinoma

    Correct Answer
    D. Mucoepidermoid carcinoma
    Explanation
    Mucoepidermoid carcinoma is the most common malignant salivary gland tumor in children. This tumor is characterized by a mixture of mucous-secreting, squamous, and intermediate cells. It typically presents as a painless mass in the parotid gland and can also occur in other major and minor salivary glands. While adenoid cystic carcinoma and monomorphic adenoma are also salivary gland tumors, they are less common in children. Papillary cystadenoma lymphomatosum is a benign tumor that is commonly known as Warthin tumor and is not malignant.

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  • 34. 

    A benign tumor composed of a proliferation of capillaries is called a

    • A.

      Schwannoma

    • B.

      Hermangioma

    • C.

      Lipoma

    • D.

      Osteoma

    Correct Answer
    B. Hermangioma
    Explanation
    A benign tumor composed of a proliferation of capillaries is called a hermangioma. This type of tumor is made up of an abnormal collection of blood vessels and can occur anywhere in the body. Hermangiomas are usually present at birth or develop during the first few weeks of life. They are most commonly found on the skin or in the liver, but can also occur in other organs. Hermangiomas are generally harmless and tend to resolve on their own without treatment.

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  • 35. 

    A white plaque like lesion that cannot be rubbed off or diagnosed as a specific disease is called

    • A.

      Speckled leukoplakia

    • B.

      Erthroplakia

    • C.

      Leukoplakia

    • D.

      Epithelial dysplasia

    Correct Answer
    C. Leukoplakia
    Explanation
    Leukoplakia is a term used to describe a white plaque-like lesion that cannot be rubbed off or diagnosed as a specific disease. It is a clinical diagnosis that indicates a potentially precancerous condition in the oral cavity. Leukoplakia can occur due to various factors such as chronic irritation, tobacco use, or infection. It is important to monitor and evaluate leukoplakia lesions regularly as they have the potential to progress to oral cancer.

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  • 36. 

    All of the following are benign lesion composed of mature compact bone except a(n)

    • A.

      Torus

    • B.

      Oisteoma

    • C.

      Exostosis

    • D.

      Ossifying fibroma

    Correct Answer
    D. Ossifying fibroma
    Explanation
    All of the options given are benign lesions composed of mature compact bone, except for ossifying fibroma. Ossifying fibroma is a benign tumor of the bone that consists of a mixture of fibrous tissue and calcified material. It is different from the other options, which are non-neoplastic conditions characterized by the formation of excess bone.

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  • 37. 

    Which one of the following malignant tumors may present as diffuse gingival enlargement with persistent bleeding?

    • A.

      Multiple myeloma

    • B.

      Metastatic lung carcinoma

    • C.

      Lymphoma

    • D.

      Leukemia

    Correct Answer
    B. Metastatic lung carcinoma
    Explanation
    Metastatic lung carcinoma can present as diffuse gingival enlargement with persistent bleeding. This occurs because cancer cells from the lung can spread to the gums and cause inflammation, leading to gingival enlargement. Additionally, the tumor can disrupt blood vessels in the gums, resulting in persistent bleeding. It is important to consider metastatic lung carcinoma as a possible cause when evaluating patients with these symptoms.

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  • 38. 

    Which one of the following malignant tumors has been reported to ashow a characteristic "sunburst" pattern on readiographic examination

    • A.

      Malignant melanoma

    • B.

      Osteosarcoma

    • C.

      Squamous cell carcinoma

    • D.

      Rhabdomyosarcoma

    Correct Answer
    B. Osteosarcoma
    Explanation
    Osteosarcoma is the correct answer because it is a malignant bone tumor that can exhibit a characteristic "sunburst" pattern on radiographic examination. This pattern is caused by the aggressive growth of the tumor, which leads to the formation of spicules of bone radiating outwards from the central tumor mass. This appearance is often seen in X-rays and is a distinguishing feature of osteosarcoma. Malignant melanoma, squamous cell carcinoma, and rhabdomyosarcoma are not typically associated with this specific radiographic pattern.

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  • 39. 

    Which one of the following malignancies is characterized by monoclonal spike on immunoelectrophoresis

    • A.

      Multiple myeloma

    • B.

      Metastic ling carcinoma

    • C.

      Lymphoma

    • D.

      Leukemia

    Correct Answer
    A. Multiple myeloma
    Explanation
    Multiple myeloma is characterized by a monoclonal spike on immunoelectrophoresis. This spike represents the abnormal production of a single clone of plasma cells, which produce a specific type of immunoglobulin. This monoclonal spike is a hallmark feature of multiple myeloma and helps in its diagnosis. Metastatic lung carcinoma, lymphoma, and leukemia do not typically exhibit this monoclonal spike on immunoelectrophoresis.

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  • 40. 

    All of the following are malignant tumors that arise from squamous epithelium except

    • A.

      Basal cell carcinoma

    • B.

      Verruccous carcinoma

    • C.

      Adenoid cystic carcinoma

    • D.

      Squamous cell carcinoma

    Correct Answer
    C. Adenoid cystic carcinoma
    Explanation
    Adenoid cystic carcinoma is not a malignant tumor that arises from squamous epithelium. It is a rare form of cancer that typically originates in the salivary glands, specifically the major and minor salivary glands. It is characterized by the formation of cysts and the growth of abnormal cells in these glands. Unlike the other options listed, which are all malignant tumors that arise from squamous epithelium, adenoid cystic carcinoma has a different origin and histological features.

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