Patho 1st Lecture, 2nd Half

Colorectal cancer is known to invade lymphatic channels and initially involve the lymph nodes immediately underlying the tumor. This means that the cancer cells can spread to the lymph nodes in the area surrounding the tumor. Venous invasion, on the other hand, can lead to metastasis, with the liver being a common site for the cancer to spread first, followed by the lungs. Therefore, the statement "True" is the correct answer.

Crohn's Disease and Chronic Ulcerative Colitis are two closely related but distinct diseases that fall under the category of Inflammatory Bowel Disease. Crohn's Disease is a chronic inflammatory condition that can affect any part of the digestive tract, while Chronic Ulcerative Colitis specifically involves inflammation and ulcers in the colon and rectum. Both conditions share similar symptoms such as abdominal pain, diarrhea, and weight loss, but they differ in terms of the areas of the digestive tract that are affected.

The patient's presentation of GI inflammation of the ileum accompanied by granulomas, as well as the presence of linear ulcers resembling cobblestones, is consistent with Crohn's Disease. Crohn's Disease is a chronic inflammatory bowel disease that can affect any part of the gastrointestinal tract, including the ileum. The characteristic cobblestone appearance of the ulcers is a common finding in Crohn's Disease. Therefore, Crohn's Disease is the most likely initial diagnosis for this patient.

The correct answer is Crohn's disease-cobblestone mucosa and creeping fat. Cobblestone mucosa refers to the appearance of the inflamed intestinal lining, which appears as a patchwork of raised areas and shallow ulcers. Creeping fat refers to the presence of fatty tissue that extends into the inflamed areas of the intestine. These findings are characteristic of Crohn's disease, an inflammatory bowel disease that can affect any part of the digestive tract.

The correct answer is Juvenile polyp. A juvenile polyp is a benign growth that commonly occurs in children and is typically found in the rectum or colon. It is characterized by a solitary, sessile lesion and can cause rectal irritation and bleeding, which aligns with the symptoms presented by the 4-year-old child in this case. Hyperplastic polyps, tubulovillous adenomas, villous adenomas, and tubular adenomas are all different types of polyps, but they are less likely to occur in children compared to juvenile polyps.

Crypt abscesses are represented by the circular capsules in the histological picture of CUC. Crypt abscesses are a characteristic feature of inflammatory bowel disease, particularly ulcerative colitis. They are formed by the accumulation of inflammatory cells, primarily neutrophils, within the crypts of the intestinal mucosa. These abscesses are often associated with ulceration and can contribute to the development of mucosal inflammation and damage in patients with CUC.

A tubulovillous polyp is predominantly tubular in shape but has villous features on at least 25% of its surface. This means that the polyp has both tubular and villous characteristics, with the villous portion being less than 25% of the total surface area. It is important to identify this type of polyp correctly as it can have a higher risk of developing into colorectal cancer compared to purely tubular or purely villous polyps.

A villous polyp is a sessile, large, broad-based tumor that projects into the lumen of the intestines forming finger-like protrusions. This type of polyp is characterized by its appearance and structure, which includes elongated, finger-like projections. It is typically larger in size compared to other types of polyps and can be found in various parts of the intestines.

In some cases, ulcerative colitis, a chronic inflammatory bowel disease, can have only one episode and then heal on its own. This means that approximately 10% of patients may experience a single episode of ulcerative colitis and then have no further recurrence or symptoms. However, it is important to note that the majority of patients with ulcerative colitis will have a chronic or recurring condition that requires ongoing management and treatment.

The term "Apple Core lesion" is used by radiologists to describe a sign that resembles the shape of an apple core on imaging studies. This sign is commonly seen in cases of colon cancer, where there is a narrowing of the colon lumen due to tumor growth. The appearance of the lesion is similar to a partially eaten apple, with the tumor causing a concentric narrowing of the colon, resembling an apple core. This term is used to aid in the diagnosis of colon cancer based on radiological findings.

The final diagnosis of colon cancer depends on histologic examination of the tissue. This involves analyzing a sample of the tumor under a microscope to determine if it is cancerous and to identify its specific characteristics. Visualizing the tumor through colonoscopy, x-ray slides, and CT scans can provide important information, but the histologic examination is necessary for a definitive diagnosis. Ultrasound examination, HIDA scan, MRI, and Fisch's opinion are not mentioned as part of the diagnostic process for colon cancer in the given information.

The intramural location of intestinal tumors makes them vulnerable to mechanical trauma by the intestinal contents, and accounts for the frequent intestinal bleeding that is a common presenting sign with intestinal tumors.

The correct answer is "Sandpaper, friable, and prone to bleeding". This is because the question mentions that the earliest lesions in CUC appear as flattened edematous patches involving the entire circumference of the colonic mucosa. The term "sandpaper" suggests a rough texture, "friable" indicates that the mucosa is easily damaged or crumbles upon touch, and "prone to bleeding" suggests that there is a tendency for bleeding to occur.

CEA stands for Carcinoembryonic Antigen. It is a glycoprotein that is typically produced by the fetal intestines but not by adult intestines. CEA is commonly used as a tumor marker to detect certain types of cancers, particularly colorectal cancer. Elevated levels of CEA in the blood may indicate the presence of cancer or the recurrence of cancer after treatment. Therefore, CEA is an important diagnostic tool in oncology.

Intestinal tumors can be found in the rectum, as mentioned in the second statement. Therefore, the statement "GI tumors are never present in the rectum, only the small and large intestine" is not true.

Bleeding is more common in patients with rectal involvement and fever only occurs in 1/3 of patients.

CUC stands for ulcerative colitis, which is a type of inflammatory bowel disease. The given histological findings of fragile mucosa, edema, inflammation, and atrophy of the crypts with lymphocytic aggregates in the base of the crypts are characteristic of ulcerative colitis. This disease primarily affects the colon and rectum, causing symptoms such as bloody diarrhea, abdominal pain, and urgency to have bowel movements.

The correct answer is arthritis, eye lesions, and skin lesions. Both Crohn's Disease and CUC can cause these extraintestinal complications. Arthritis refers to inflammation in the joints, which can occur in both conditions. Eye lesions can manifest as uveitis or episcleritis, and skin lesions can include erythema nodosum or pyoderma gangrenosum. These complications are not specific to either Crohn's Disease or CUC, but can occur in both conditions.

The patient's symptoms of GI inflammation primarily affecting the left side of the colon, with diffuse and limited lesions to the mucosa and submucosa, suggest the initial diagnosis of CUC (Ulcerative Colitis). This is a chronic inflammatory bowel disease that specifically affects the colon and rectum, causing inflammation and ulcers in the lining of the colon. The symptoms described align with the characteristic features of CUC, making it the most likely initial diagnosis in this case.

The term "napkin-ring" lesions refers to a specific appearance of adenocarcinomas in the sigmoid and rectum. These tumors have a characteristic pattern of infiltration, where they grow in a circumferential manner, encircling the intestine. This results in a narrowing of the lumen, resembling a napkin ring. This pattern of growth is distinct from tumors of the right side of the colon, which typically grow as fungating masses or ulcerated shallow-like craters. Similarly, tumors of the small intestine may infiltrate the intestine circumferentially, but they are not specifically referred to as "napkin-ring" lesions. Therefore, the correct answer is adenocarcinomas of the sigmoid and rectum that tend to infiltrate the intestine circumferentially.

The correct answer is CUC is 2-3 times more prevalent than Crohn's Disease. This means that the prevalence of CUC (20-40/100,000) is higher compared to the prevalence of Crohn's Disease (70-150/100,000). The answer indicates that CUC is more commonly found in Western countries than Crohn's Disease.

Pseudopolyps represent foci of mucosal regeneration that may undergo malignant transformation which is the most significant late complication of CUC.

The picture shows colonic ulcerations that spread through the entire colon and become confluent during ulcerative colitis, known as serpiginous ulcerations. This explanation accurately describes the features seen in the picture, where the ulcerations are spread throughout the colon and have a serpiginous, or winding, appearance. This is a characteristic finding in ulcerative colitis, a chronic inflammatory bowel disease.

CEA cannot be used for early detection or for screening populations at risk because it is also elevated during CUC and other non-specific intestinal inflammations. Instead it is useful as a follow-up tool for patients whose carcinoma has been resected, when rise in CEA level means recurrence.

The correct answer explains that Inflammatory Pseudopolyps in CUC are small remnants of inflamed mucosa that appear to be elevated over the base of the surrounding ulcerations. This suggests that the pseudopolyps are formed as a result of the body's inflammatory response to the ulcerations in the colon. The inflamed mucosa forms small protrusions or polyps as a way to heal and protect the damaged tissue.

Adenocarcinomas of the left side of the colon tend to narrow the intestine and obstruct the passage of feces. This can result in constipation and the production of narrow, pencil-like feces. Additionally, a positive test for occult blood in the feces predicts the presence of cancer or an adenoma in 40-50% of cases. However, chronic blood loss with dark red feces leading to anemia is not true of adenocarcinomas of the left side of the colon.

The correct answer is 20%, 30-35%, 50%. The risk for progression to adenocarcinoma increases as the polyp morphology changes from tubular to tubulovillous to villous. Tubular adenomas have the lowest risk of progression at 20%, followed by tubulovillous adenomas at 30-35%, and villous adenomas have the highest risk at 50%.

Stage B in the Duke classification of Adenocarcinoma of the intestine signifies that the tumor has penetrated the muscle wall and pericolic fat, but it does not involve the lymph nodes. This stage indicates that the cancer has spread beyond the inner lining of the intestine but has not yet reached the lymph nodes or distant organs. It is an intermediate stage between localized cancer and cancer that has spread to other parts of the body.

The appendix is a small pouch-like organ attached to the large intestine. While it was previously believed to have no significant function, recent studies suggest that the appendix may play a role in the immune system, specifically in the storage and maturation of beneficial gut bacteria. Crohn's Disease is a chronic inflammatory bowel disease that can affect any part of the digestive tract, including the appendix. Although not all cases of Crohn's Disease involve the appendix, it is involved in a significant number of cases. Therefore, the statement "The appendix is involved in most cases of Crohn's Disease" is true.

Cancers of the right side of the colon do not typically cause narrow and pencil-like stools. This symptom is more commonly associated with cancers of the left side of the colon. Cancers of the right side of the colon tend to be clinically silent, meaning they do not cause noticeable symptoms in the early stages. They may produce non-specific signs such as weakness and fatigue, and chronic blood loss with melena (dark, tarry stools) can lead to anemia.

In Crohn's Disease, the formation of a fistula is caused by inflammation of the serosa, which leads to adhesions with adjacent intestinal loops. This inflammation can result in the formation of abnormal connections between different parts of the intestine or between the intestine and other organs, creating fistulas. These fistulas can cause complications such as infection, abscesses, and the passage of stool or bacteria into other areas of the body.

The 3rd most common type of malignant disease behind breast and lung cancer is cancer of the intestines. This type of cancer refers to the abnormal growth of cells in the intestines, which can lead to various symptoms and complications. It is important to detect and treat this cancer early to improve the chances of successful treatment and survival.

Colonoscopy, X-ray, and mucosal biopsy are diagnostic tools commonly used to identify Crohn's Disease. Colonoscopy allows doctors to examine the entire colon and rectum, looking for signs of inflammation, ulcers, or other abnormalities. X-ray imaging can help identify areas of inflammation or narrowing in the digestive tract. Mucosal biopsy involves taking small tissue samples from the lining of the digestive tract to examine for inflammation and other characteristic features of Crohn's Disease. By combining these three diagnostic methods, doctors can gather comprehensive information to confirm the presence of Crohn's Disease and determine the extent and location of the inflammation.

Colon cancer accounts for 95% of malignant tumors of the intestine and is 10 times more more common in the U.S. and other Western countries than in Asia and Africa.

The correct answer describes Peyer's Patches as shallow mucosal defects overlying lymphoid aggregates, which suggest immune cell involvement seen in Crohn's disease. This explanation indicates that Peyer's Patches are areas of the intestinal mucosa that have been damaged and show signs of immune cell activity. This is a characteristic feature of Crohn's disease, a chronic inflammatory condition that primarily affects the gastrointestinal tract.

Rubber-hose fibrosis refers to the fibrosis of the muscularis and serosa layers of the intestinal wall in Crohn's disease. This fibrosis causes the wall to become thickened and rigid. The presence of sharply demarcated non-caseating granulomas within the mucosa and submucosa, along with the associated fibrosis, is a characteristic sign of Crohn's disease. This description aligns with the concept of rubber-hose fibrosis in Crohn's disease.

The 5 year survival rate for patients with Class A,B,C,D Adenocarcinom is highest for Class A with 85%, followed by Class B with 60%, Class C with 40%, and Class D with 5%. This suggests that patients with Class A Adenocarcinom have the best prognosis and are more likely to survive for 5 years compared to patients with Class B, C, and D. On the other hand, patients with Class D have the lowest survival rate, indicating a poorer prognosis.

Non-neoplastic polyps are characterized by the presence of normal glandular and stromal cells, while neoplastic polyps contain neoplastic epithelium that lacks normal differentiation. This means that non-neoplastic polyps are made up of cells that appear and function normally, whereas neoplastic polyps consist of abnormal cells that do not exhibit normal characteristics.

Benign neoplastic polyps are growths that are not cancerous. The given statement, "Most common in Asian populations," is not true about all benign neoplastic polyps. The incidence of these polyps may vary across different populations and ethnicities, and it is not specific to Asian populations.

Some can also be sessile

Crohn's Disease commonly occurs in different parts of the gastrointestinal tract. The correct order for the most common places of occurrence for Crohn's Disease is as follows: In 50% of cases, the disease affects both the terminal ileum and colon. In 30% of cases, it affects only the ileum, and in 20% of cases, it is limited to the colon. This means that the majority of cases involve both the terminal ileum and colon, followed by cases involving only the ileum, and a smaller percentage limited to the colon.

Hyperplastic polyps are not a possible presentation of established invasive carcinoma of the colon. Hyperplastic polyps are benign growths that do not have the potential to become cancerous. In contrast, invasive carcinoma of the colon is a malignant tumor that can cause symptoms such as ulcerations, exophytic protruding masses, and mucosal plaques. Villous polyps can also be a presentation of invasive carcinoma, as they have the potential to become cancerous. Therefore, the presence of hyperplastic polyps would not be indicative of invasive carcinoma.

It is in Crohn's disease that involvement of the colon is typically segmental.

The correct answer is endoscopy or x-ray examination with barium enema. This method allows for visualization of the tumors protruding into the lumen of the intestine. Endoscopy involves the use of a flexible tube with a camera to directly visualize the inside of the intestine. X-ray examination with barium enema involves the administration of a contrast material (barium) into the rectum, which coats the lining of the intestine and allows for better visualization of any abnormalities on x-ray images. These methods are commonly used to diagnose and evaluate intestinal neoplasms of epithelial origin.

Stage B2 in the Astler-Collier System of Classification of Adenocarcinoma of the intestine refers to the tumor penetrating through the muscularis propria but not extending further. Additionally, it indicates that the lymph nodes are not involved or affected by the tumor.

Juvenile polyps are also known as "retention polyps" for the same reason listed above.

Over 80% are located in the rectosigmoid area.

The picture is a villous adenoma and invasive carcinoma is found in over 50% of these tumors, not just 20-35%.

The disease described above is CUC and is diagnosed by clinical, radiographic, and pathologic evaluation.

Hyperplastic polyps never lead to malignancy.