Gastrointestinal Pathology Practice Questions

Q: Which of the following morphological features is most characteristic for distinguishing ulcerative colitis from Crohn's disease?

Diffuse distribution of pseudopolyps. ***Diffuse distributions of pseudopolyps*** - ***Ulcerative colitis*** is characterized by the presence of **pseudopolyps**, which are formed due to mucosal regeneration and are distributed diffusely throughout the affected areas [2][3]. - The presence and distribution of **pseudopolyps** are specifically associated with **mucosal inflammation** in ulcerative colitis, helping distinguish it from Crohn's disease [2]. *Crypt abscesses* - Crypt abscesses are often seen in **both ulcerative colitis** and Crohn's disease but are more prominent in ulcerative colitis [1][2]. - They do not distinctly distinguish between the two conditions, as both can show this histological feature [2]. *Mucosal edema* - Mucosal edema can occur in both ulcerative colitis and Crohn's disease during active inflammation [2]. - It's a nonspecific sign and lacks the diagnostic specificity needed to differentiate the two diseases [2]. *Lymphoid aggregates in the mucosa* - Lymphoid aggregates may be found in Crohn's disease and, to a lesser degree, in ulcerative colitis, but are not unique to either condition [2][4]. - This feature is seen variably in both diseases and fails to serve as a distinguishing morphological trait [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 809. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 365-366. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 367-368. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 806-807.

Q: Which disease is classically diagnosed by jejunal biopsy?

Celiac disease. ***Intestinal lymphoma*** - **Jejunal biopsy** can reveal **malignant cells** confirming intestinal lymphoma, which often presents with weight loss and abdominal pain. - Associated with **tissue infiltration** of neoplastic cells leading to diagnostic confirmation. *Argentaffinoma of intestine* - While **argyrophilic cells** can be involved, diagnosis typically requires **endoscopic biopsy** rather than jejunal biopsy. - Symptoms may include **flushing** and **diarrhea**, but it does not typically require a jejunal biopsy for diagnosis. *Tropical sprue* - Diagnosis is usually based on **clinical history** and **response to treatment**, rather than a jejunal biopsy specifically. - It is characterized by **malabsorption**, diarrhea, and nutritional deficiencies, which can be managed clinically. *Celiac disease* - Diagnosis requires **duodenal biopsy** to assess for **villous atrophy**, not jejunal biopsy [1]. - Associated with symptoms like **diarrhea** and **malabsorption**, but definitive diagnosis focuses on the duodenum. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 361-362.

Q: Carcinoma associated most commonly with upper one third of esophagus is?

Squamous Cell Carcinoma. **Squamous Cell Carcinoma** - **Squamous cell carcinoma** is the predominant type of esophageal cancer in the **upper and middle thirds** of the esophagus. - This type is strongly associated with risk factors such as **smoking** and **alcohol consumption**. *Adenocarcinoma* - **Adenocarcinoma** is most commonly found in the **distal esophagus** and **gastroesophageal junction**. - It is often associated with **Barrett's esophagus**, a metaplastic change due to chronic gastroesophageal reflux disease (GERD). *Adeno-squamous Carcinoma* - **Adeno-squamous carcinoma** is a rare mixed tumor with both glandular and squamous differentiation. - It can occur in any part of the esophagus, but is less common overall than either adenocarcinoma or squamous cell carcinoma alone. *Leiomyosarcoma* - **Leiomyosarcoma** is a malignant tumor arising from the **smooth muscle** lining the esophagus. - It is an extremely rare form of esophageal cancer, far less common than epithelial carcinomas.

Q: Collar button ulcer is found in?

Ulcerative colitis. ***Ulcerative colitis*** - **Collar button ulcers** are a classic and characteristic gross pathological finding in ulcerative colitis - These ulcers have a distinctive morphology: a narrow opening at the mucosal surface with a wider base that undermines the surrounding mucosa, creating a flask-shaped or "collar button" appearance - The undermining occurs because the inflammatory infiltrate in the lamina propria causes mucosal detachment, while the surface epithelium remains relatively intact initially - This is a hallmark feature described in standard pathology texts and frequently tested in medical examinations *Crohn's disease* - Crohn's disease shows transmural inflammation with different ulcer patterns including linear/serpentine ulcers, aphthous ulcers, and deep fissuring ulcers - The characteristic appearance is "cobblestone mucosa" due to linear ulcers with intervening edematous mucosa - Does NOT characteristically show collar button ulcers - the morphology is fundamentally different *Shigella* - Shigella infection causes acute infectious colitis with superficial mucosal ulceration and pseudomembrane formation - The ulceration is typically diffuse and superficial, not showing the characteristic undermining pattern of collar button ulcers - The inflammatory process differs from the chronic undermining seen in ulcerative colitis *All of the options* - Incorrect, as collar button ulcers are specifically characteristic of ulcerative colitis - While other conditions cause colonic ulceration, they have different morphological patterns

Q: What is the primary cancer associated with mutations in the APC gene?

Colorectal carcinoma. ***Colorectal carcinoma*** - The **APC gene** is a tumor suppressor gene that, when mutated, is associated with the development of **familial adenomatous polyposis (FAP)** [3] and sporadic colorectal cancer [2]. - Loss of APC function leads to **upregulation of beta-catenin** [1], promoting cell proliferation in the colon [1]. *Esophageal adenocarcinoma* - Primarily linked to **Barrett's esophagus** and chronic gastroesophageal reflux disease (GERD), not directly related to APC mutation. - Genetic alterations in this cancer typically involve **TP53** and **CDKN2A** rather than APC. *Gastric lymphoma* - Gastric lymphoma is often associated with **H. pylori infection**, and while certain genes are implicated, APC is not among the key contributors. - Typically arises from gastric mucosa-associated lymphoid tissue (MALT) rather than direct APC mutations. *Gastric carcinoma* - Although gastric carcinoma can involve various genetic changes, it's mainly associated with **hereditary diffuse gastric cancer syndromes** linked to mutations in the **CDH1** gene. - APC is primarily implicated in colorectal malignancies, not gastric cancer, though FAP patients with germline APC mutations do have increased risk of intestinal-type gastric cancer [4]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 304-305. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 819. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 817. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 778-779.

Q: Which cancer is associated with the Cag A gene?

MALT lymphoma. ***MALT lymphoma*** - The Cag A gene is associated with **Helicobacter pylori**, which is a known risk factor for developing **MALT lymphoma** in the gastric mucosa [1]. - Its presence can lead to **chronic inflammation**, contributing to lymphoid tissue proliferation and the development of lymphoma [1]. *Lung carcinoma* - Lung carcinoma is primarily linked to **smoking** and other environmental factors, rather than the Cag A gene. - It does not have a direct association with **Helicobacter pylori** infection, contrasting with MALT lymphoma. *Hepatocellular carcinoma* - Hepatocellular carcinoma is predominantly caused by **chronic hepatitis B or C infections**, ethanol-related liver disease, and **aflatoxin exposure**. - The Cag A gene does not play a significant role in its pathogenesis or development. *Esophageal carcinoma* - Esophageal carcinoma is typically associated with **Barrett's esophagus**, **smoking**, or **alcohol use**, not the Cag A gene. - While chronic injury can lead to esophageal changes, **Helicobacter pylori** does not directly contribute to its etiology. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 356-357.

Q: What is the most common type of anal canal carcinoma?

Squamous cell carcinoma. ***Squamous cell carcinoma*** - This is the most prevalent type of anal canal carcinoma, accounting for over **80% of all anal cancers**. - It arises from the **squamous epithelial cells** lining the anal canal, often linked to **HPV infection**. *Adenocarcinoma* - This type of cancer originates from the **glandular cells** in the upper part of the anal canal or from **anal glands**. - It is a much rarer form of anal cancer compared to squamous cell carcinoma. *Adenoacanthoma* - This is a rare variant of **adenocarcinoma** that also contains foci of benign or malignant squamous differentiation. - It is not the most common type and represents a specific histological subtype. *Papillary carcinoma* - This term describes a **growth pattern** of various carcinomas characterized by finger-like projections or papillae. - It is not a distinct primary type of anal canal carcinoma, but rather a descriptive feature that can be found in some adeno- or squamous cell carcinomas.

Q: Which condition is characterized by skip lesions in the gastrointestinal tract?

Crohn's disease. ***Crohn's disease*** [1] - Characterized by **skip lesions** which are segmental areas of inflammation interspersed with normal bowel, consistent with the presence of **granulomatous inflammation** [1][2][3]. - It can affect any part of the gastrointestinal tract [1], often leading to chronic symptoms like **abdominal pain** and **diarrhea**. *Reiter's disease* - Primarily manifests as **arthritis**, **urethritis**, and **conjunctivitis**, without granulomatous lesions. - It is a reactive arthritis often associated with infection rather than inflammatory bowel disease. *Ulcerative colitis* - Characterized by continuous lesions of the colon and does not exhibit the **skip lesions** typical of Crohn's disease. - Mainly involves the **mucosal layer** and is associated with symptoms like **bloody diarrhea** and mucosal ulceration. *Whipple's disease* - Caused by *Tropheryma whipplei*, leading to **malabsorption syndrome**; however, it is not associated with skip lesions. - It typically involves the **gut mucosa** and has systemic manifestations, rather than the localized granulomatous lesions seen in Crohn's disease. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 365-366. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 366-367. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 806-807.

Q: Backwash ileitis is seen in

Ulcerative colitis. ***Ulcerative colitis*** - Backwash ileitis occurs when inflammation from the colon extends to the **ileum**, commonly seen in patients with extensive ulcerative colitis [1]. - The condition is specifically noted in cases where there is a **prolonged and severe** colonic disease involving the rectum and left colon [1]. *heal polyp* - Heal polyps are generally not associated with **ileitis** or specific inflammatory bowel disease presentations. - They are benign growths and do not cause significant **intestinal inflammation** like ulcerative colitis does. *Crohn's disease* - Unlike backwash ileitis, Crohn's disease involves **transmural inflammation** that can affect any part of the gastrointestinal tract. - Backwash ileitis specifically refers to the inflammatory changes that occur in the ileum due to underlying colonic disease [1]. *Colonic carcinoma* - Colonic carcinoma primarily presents with **malignant transformation** but does not typically cause ileitis. - There's no direct correlation between colonic carcinoma and backwash ileitis, as they represent different conditions.

Question 1

Which of the following morphological features is most characteristic for distinguishing ulcerative colitis from Crohn's disease?

Accepted Answer

Diffuse distribution of pseudopolyps

Answer

Lymphoid aggregates in the mucosa

Answer

Crypt abscesses

Answer

Mucosal edema

Question 2

Which disease is classically diagnosed by jejunal biopsy?

Accepted Answer

Celiac disease

Answer

Argentaffinoma of intestine

Answer

Tropical sprue

Answer

Intestinal lymphoma

Question 3

Carcinoma associated most commonly with upper one third of esophagus is?

Accepted Answer

Squamous Cell Carcinoma

Answer

Adenocarcinoma

Answer

Adeno-squamous Carcinoma

Answer

Leiomyosarcoma

Question 4

Collar button ulcer is found in?

Accepted Answer

Ulcerative colitis

Answer

Shigella

Answer

Crohn's disease

Answer

All of the options

Question 5

What is the primary cancer associated with mutations in the APC gene?

Accepted Answer

Colorectal carcinoma

Answer

Gastric carcinoma

Answer

Gastric lymphoma

Answer

Esophageal adenocarcinoma

Question 6

Which cancer is associated with the Cag A gene?

Accepted Answer

MALT lymphoma

Answer

Hepatocellular carcinoma

Answer

Esophageal carcinoma

Answer

Lung carcinoma

Question 7

What is the most common type of anal canal carcinoma?

Accepted Answer

Squamous cell carcinoma

Answer

Adenocarcinoma

Answer

Adenoacanthoma

Answer

Papillary carcinoma

Question 8

What is the best assessment for the tendency of colonic carcinoma to metastasize?

Accepted Answer

Depth of penetration of bowel wall (T stage)

Answer

Size of tumor

Answer

Carcinoembryonic antigen (CEA) levels

Answer

Histological grade of the tumor

Question 9

Which condition is characterized by skip lesions in the gastrointestinal tract?

Accepted Answer

Crohn's disease

Answer

Ulcerative colitis

Answer

Whipple's disease

Answer

Reactive arthritis

Question 10

Backwash ileitis is seen in

Accepted Answer

Ulcerative colitis

Answer

Colonic carcinoma

Answer

Crohn's disease

Answer

Ileal polyp

Gastrointestinal Pathology — MCQs

Gastrointestinal Pathology — MCQs

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