Colorectal Surgery Practice Questions

Q: All are true about intestinal polyp syndromes except:

Colonic hyperplastic polyp has malignant potential. **Explanation:** The correct answer is **D**. In clinical practice, **hyperplastic polyps** are the most common type of non-neoplastic polyps. They are typically small (<5mm), located in the rectum or sigmoid colon, and are characterized histologically by a "sawtooth" appearance of the surface epithelium. Crucially, they lack cellular atypia and are considered to have **no malignant potential**. (Note: They must be distinguished from "Sessile Serrated Adenomas," which do have malignant potential). **Analysis of other options:** * **A. Cowden Disease:** This is an autosomal dominant condition caused by a mutation in the **PTEN gene**. It is characterized by multiple **hamartomatous polyps** throughout the GI tract, along with extra-intestinal features like trichilemmomas and an increased risk of breast and thyroid cancer. * **B. HNPCC (Lynch Syndrome):** While HNPCC is characterized by a high risk of colorectal cancer due to **DNA mismatch repair (MMR) gene mutations**, it is specifically defined by the *absence* of extensive polyposis. Patients develop only a few adenomas, but these adenomas progress to carcinoma much more rapidly than in the general population. * **C. Peutz-Jeghers Syndrome (PJS):** PJS involves hamartomatous polyps and mucocutaneous pigmentation. While the polyps themselves are hamartomas, patients have a significantly **increased lifetime risk of various cancers**, including colorectal, small bowel, pancreatic, and breast carcinoma. **High-Yield Clinical Pearls for NEET-PG:** * **Gardner Syndrome:** FAP + Osteomas + Soft tissue tumors (Desmoid tumors). * **Turcot Syndrome:** FAP/HNPCC + CNS tumors (Medulloblastoma/Glioblastoma). * **PJS Gene:** STK11 (LKB1) on Chromosome 19. * **Most common site for PJS polyps:** Small Intestine (Jejunum).

Q: Multiple epidermoid cysts are seen in which of the following conditions?

Gardner's syndrome. **Explanation:** **Gardner’s Syndrome** is a clinical variant of Familial Adenomatous Polyposis (FAP) caused by a mutation in the **APC gene** on chromosome 5q21. It is characterized by a classic triad of: 1. **Colonic Polyposis:** Thousands of adenomatous polyps with a 100% risk of malignancy. 2. **Osteomas:** Particularly of the mandible and skull. 3. **Soft Tissue Tumors:** Most notably **multiple epidermoid cysts**, desmoid tumors, and fibromas. The presence of multiple epidermoid cysts in a young patient is a high-yield clinical "red flag" that should prompt an evaluation for occult colonic polyposis. **Analysis of Incorrect Options:** * **Turcot’s Syndrome:** Also an APC or MMR gene mutation, but it associates colonic polyposis with **Central Nervous System (CNS) tumors** (Medulloblastoma or Glioblastoma), not skin cysts. * **Peutz-Jeghers Syndrome:** Characterized by **hamartomatous polyps** and mucocutaneous hyperpigmentation (melanotic spots on lips/oral mucosa). It is caused by the STK11 mutation. * **Familial Polyposis Coli (FAP):** While Gardner’s is a subtype of FAP, the term "FAP" typically refers to the isolated colonic manifestations. Gardner’s specifically describes the syndrome when **extracolonic manifestations** like epidermoid cysts are present. **High-Yield Clinical Pearls for NEET-PG:** * **CHRPE:** Congenital Hypertrophy of Retinal Pigment Epithelium is the earliest sign of Gardner’s Syndrome. * **Desmoid Tumors:** These are locally aggressive fibrous tumors often occurring post-surgery in Gardner’s patients. * **Dental Abnormalities:** Impacted teeth or supernumerary teeth are common findings.

Q: Carcinoma of the right colon commonly presents as:

Fungating lesion. **Explanation:** Carcinoma of the colon exhibits distinct morphological patterns depending on its anatomical location. This difference is primarily due to the embryological origin and the diameter of the bowel lumen. **1. Why "Fungating lesion" is correct:** The **right colon** (caecum and ascending colon) has a large diameter and thin, distensible walls. Additionally, the fecal matter here is liquid. Because there is ample space, tumors tend to grow as large, **exophytic, cauliflower-like, or fungating masses** that protrude into the lumen. These lesions often bleed chronically, leading to iron deficiency anemia, but rarely cause early obstruction. **2. Why the other options are incorrect:** * **Stenosing/Infiltrating lesions:** These are characteristic of the **left colon** (descending and sigmoid colon). The left colon has a narrower lumen and thicker walls. Tumors here tend to grow circumferentially (annular growth), leading to the classic "napkin-ring" appearance and early intestinal obstruction. * **Ulcerating lesion:** While any colorectal cancer can ulcerate and bleed, it is not the primary morphological description used to differentiate right-sided from left-sided growths in standard surgical pathology. **Clinical Pearls for NEET-PG:** * **Right-sided growth:** Presents with **Anemia** (occult blood loss), palpable mass in the right iliac fossa, and weight loss. * **Left-sided growth:** Presents with **altered bowel habits** (constipation/diarrhea) and features of intestinal obstruction. * **Most common site:** Historically the rectum, but there is a shifting trend toward the proximal colon (Right-sided shift). * **Investigation of choice:** Colonoscopy with biopsy. * **Tumor Marker:** CEA (primarily used for monitoring recurrence, not screening).

Q: All of the following are true about Gardner's Syndrome except:

Polyps rarely undergo malignant transformation.. **Explanation:** Gardner’s Syndrome is a phenotypic variant of **Familial Adenomatous Polyposis (FAP)**. The hallmark of this condition is the development of hundreds to thousands of adenomatous colorectal polyps due to a mutation in the **APC gene** on chromosome 5q21. **1. Why Option D is the Correct Answer (The False Statement):** The polyps in Gardner’s Syndrome are **adenomatous**, not hamartomatous. These polyps have a **100% risk of malignant transformation** into colorectal cancer, usually by age 40, if a prophylactic total proctocolectomy is not performed. Therefore, stating they "rarely undergo malignant transformation" is clinically incorrect. **2. Analysis of Other Options:** * **Option A (Autosomal Dominant):** Gardner’s Syndrome follows an autosomal dominant inheritance pattern, consistent with FAP. * **Option B (Sebaceous Cysts):** Extra-intestinal manifestations are a key feature of Gardner’s. These include **sebaceous (epidermoid) cysts**, lipomas, and fibromas. * **Option C (Duodenal Polyps):** While the primary site is the colon, patients frequently develop polyps in the **duodenum** (specifically periampullary adenomas), which are the second most common site of malignancy in these patients. **Clinical Pearls for NEET-PG:** * **The Triad of Gardner’s:** Colonic polyposis, Osteomas (usually of the mandible/skull), and Soft tissue tumors (epidermoid cysts, desmoid tumors). * **CHRPE:** Congenital Hypertrophy of Retinal Pigment Epithelium is a highly specific bedside screening marker for FAP/Gardner’s. * **Turcot Syndrome:** Another FAP variant associated with CNS tumors (Medulloblastoma). * **Management:** Gold standard is prophylactic surgery (IPAA - Ileal Pouch-Anal Anastomosis).

Q: A 22-year-old male presents with a family history of colorectal adenocarcinoma in his father. What is a possible diagnosis given this information?

Gardner's syndrome. **Explanation:** The clinical presentation of a young patient with a strong family history of colorectal adenocarcinoma points toward an **Autosomal Dominant** polyposis syndrome, most commonly **Familial Adenomatous Polyposis (FAP)** or its variants. **Gardner’s Syndrome (Option D)** is a phenotypic variant of FAP caused by a mutation in the **APC gene** on chromosome 5q21. It is characterized by the triad of: 1. **Colonic Polyposis:** Hundreds to thousands of adenomatous polyps with a 100% risk of progression to adenocarcinoma if left untreated. 2. **Soft Tissue Tumors:** Epidermoid cysts, fibromas, and desmoid tumors. 3. **Bone Tumors:** Osteomas (typically of the mandible or skull). **Why other options are incorrect:** * **Turcot Syndrome (Option A):** Also a variant of FAP/HNPCC, but it is specifically associated with **Central Nervous System (CNS) tumors** (e.g., medulloblastoma or glioblastoma) rather than the extra-colonic manifestations described in Gardner's. * **Peutz-Jeghers Syndrome (Option B):** Characterized by **hamartomatous polyps** and mucocutaneous hyperpigmentation. While it increases cancer risk, it is not the classic diagnosis for a young patient presenting with a primary family history of early-onset adenocarcinoma in this context. * **Cowden’s Disease (Option C):** Part of the PTEN Hamartoma Tumor Syndrome. It features multiple hamartomas and carries a high risk of breast, thyroid, and endometrial cancers, but is less commonly associated with early-onset colorectal adenocarcinoma compared to FAP variants. **High-Yield NEET-PG Pearls:** * **CHRPE** (Congenital Hypertrophy of Retinal Pigment Epithelium) is the earliest extra-colonic sign of FAP/Gardner’s. * **Desmoid tumors** are a significant cause of morbidity in Gardner’s syndrome post-colectomy. * The standard treatment for FAP/Gardner's is **Proctocolectomy with Ileal Pouch-Anal Anastomosis (IPAA)**.

Q: What is the mode of inheritance for Gardner syndrome?

Autosomal dominant. **Explanation:** Gardner syndrome is a phenotypic variant of **Familial Adenomatous Polyposis (FAP)**. It is caused by a germline mutation in the **APC (Adenomatous Polyposis Coli) gene** located on chromosome **5q21**. Like FAP, Gardner syndrome follows an **autosomal dominant** inheritance pattern, meaning a single copy of the mutated gene from one parent is sufficient to cause the disorder. Offspring of an affected individual have a 50% chance of inheriting the condition. **Analysis of Options:** * **Option A (Autosomal recessive):** Incorrect. While some polyposis syndromes like MAP (*MUTYH*-associated polyposis) are recessive, Gardner syndrome is strictly dominant. * **Option C (X-linked):** Incorrect. The APC gene is located on an autosome (Chromosome 5), not a sex chromosome. * **Option D:** Incorrect, as the inheritance pattern is well-established. **Clinical Pearls for NEET-PG:** * **The Triad:** Gardner syndrome is characterized by the clinical triad of **Colonic Polyposis** (100% risk of colorectal cancer), **Extra-abdominal tumors** (Osteomas, typically of the mandible/skull), and **Soft tissue tumors** (Epidermoid cysts, Fibromas, and Desmoid tumors). * **Ocular Finding:** Congenital Hypertrophy of Retinal Pigment Epithelium (**CHRPE**) is a highly specific early marker. * **Dental Abnormalities:** Supernumerary teeth and impacted teeth are common. * **Management:** Due to the 100% malignancy risk, prophylactic **Total Proctocolectomy** is the standard of care, usually performed in the second decade of life.

Question 1

All are true about intestinal polyp syndromes except:

Accepted Answer

Colonic hyperplastic polyp has malignant potential

Answer

Cowden disease - Hamartomatous polyps

Answer

Hereditary nonpolyposis colorectal carcinoma (HNPCC) - Multiple adenomatous polyps

Answer

Peutz-Jeghers syndrome - associated with colonic carcinoma

Question 2

A 40-year-old male with descending colon cancer presents with acute intestinal obstruction. What is the emergency treatment of choice?

Accepted Answer

Hartman's procedure

Answer

Ileostomy

Answer

Left hemicolectomy

Answer

Total colectomy

Question 3

Multiple epidermoid cysts are seen in which of the following conditions?

Accepted Answer

Gardner's syndrome

Answer

Turcot's syndrome

Answer

Peutz-Jegher syndrome

Answer

Familial polyposis coli

Question 4

A 70-year-old male presents with a history of lower gastrointestinal bleeding for the last six months. Sigmoidoscopic examination reveals a 4 cm mass located 3.5 cm above the anal verge. What is the treatment of choice?

Accepted Answer

Abdominoperineal resection

Answer

Colostomy

Answer

Anterior resection

Answer

Defunctioning anastomosis

Question 5

Carcinoma of the right colon commonly presents as:

Accepted Answer

Fungating lesion

Answer

Ulcerating lesion

Answer

Stenosing lesion

Answer

Infiltrating lesion

Question 6

What is the recommended margin of clearance for anal carcinoma?

Accepted Answer

2 cm

Answer

3 cm

Answer

4 cm

Answer

5 cm

Question 7

All of the following are true about Gardner's Syndrome except:

Accepted Answer

Polyps rarely undergo malignant transformation.

Answer

Autosomal dominant inheritance.

Answer

Associated sebaceous cysts are seen.

Answer

Development of hamartomatous polyps in the duodenum.

Question 8

Full bowel preparation is avoided in which of the following conditions?

Accepted Answer

Carcinoma of the colon

Answer

Hirschsprung disease

Answer

Ulcerative colitis

Answer

Irritable bowel syndrome

Question 9

A 22-year-old male presents with a family history of colorectal adenocarcinoma in his father. What is a possible diagnosis given this information?

Accepted Answer

Gardner's syndrome

Answer

Turcot syndrome

Answer

Peutz-Jeghers syndrome

Answer

Cowden's disease

Question 10

What is the mode of inheritance for Gardner syndrome?

Accepted Answer

Autosomal dominant

Answer

Autosomal recessive

Answer

X-linked

Answer

None of the above

Colorectal Surgery — MCQs

Colorectal Surgery — MCQs

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