Colorectal Surgery — MCQs

Colorectal Surgery Indian Medical PG Practice Questions and MCQs

Question 151: All are true about intestinal polyp syndromes except:

A. Cowden disease - Hamartomatous polyps
B. Hereditary nonpolyposis colorectal carcinoma (HNPCC) - Multiple adenomatous polyps
C. Peutz-Jeghers syndrome - associated with colonic carcinoma
D. Colonic hyperplastic polyp has malignant potential (Correct Answer)

Explanation: **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).

Question 152: A 40-year-old male with descending colon cancer presents with acute intestinal obstruction. What is the emergency treatment of choice?

A. Hartman's procedure (Correct Answer)
B. Ileostomy
C. Left hemicolectomy
D. Total colectomy

Explanation: ### **Explanation** The management of an obstructing left-sided colonic malignancy (descending colon or sigmoid) is a classic surgical dilemma. In an emergency setting, the primary goals are to relieve the obstruction and resect the tumor while ensuring patient safety. **Why Hartman’s Procedure is the Correct Choice:** Hartman’s procedure involves **resection of the diseased segment, creation of an end colostomy, and closure of the distal rectal stump.** * **Safety in Emergency:** In acute obstruction, the proximal bowel is often dilated, edematous, and loaded with fecal matter (unprepared bowel). * **Avoidance of Anastomosis:** Performing a primary anastomosis (joining the ends) in an emergency carries a high risk of **anastomotic leak** due to poor bowel wall integrity and potential bacterial translocation. Hartman’s procedure eliminates this risk, making it the safest "gold standard" for an unstable patient or an unprepared bowel. **Analysis of Incorrect Options:** * **B. Ileostomy:** A loop ileostomy is a diverting procedure. While it relieves the obstruction, it leaves the tumor *in situ*. It is generally reserved for palliation or as a temporary measure if the patient is too unstable for any resection. * **C. Left Hemicolectomy:** While this is the definitive oncological surgery, performing it with **primary anastomosis** in an emergency setting is risky due to the high failure rate of the suture line in an obstructed, edematous bowel. * **D. Total Colectomy:** This is usually reserved for cases with a "closed-loop" obstruction where the cecum has perforated or is about to perforate (impending gangrene), or in cases of synchronous tumors. **Clinical Pearls for NEET-PG:** * **Right-sided obstruction:** The treatment of choice is usually a **Right Hemicolectomy with Primary Ileocolic Anastomosis** (the ileum has a better blood supply and lower leak rate than the colon). * **Left-sided obstruction:** The traditional choice is **Hartman’s Procedure**. However, in stable patients, "On-table Colonic Irrigation" followed by primary anastomosis is an alternative. * **Stenting:** Self-expanding metal stents (SEMS) are increasingly used as a "bridge to surgery" to convert an emergency case into an elective one.

Question 153: Multiple epidermoid cysts are seen in which of the following conditions?

A. Turcot's syndrome
B. Gardner's syndrome (Correct Answer)
C. Peutz-Jegher syndrome
D. Familial polyposis coli

Explanation: **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.

Question 154: 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?

A. Colostomy
B. Anterior resection
C. Abdominoperineal resection (Correct Answer)
D. Defunctioning anastomosis

Explanation: ### **Explanation** The management of rectal cancer is primarily determined by the distance of the tumor from the **anal verge** and the ability to achieve a clear **distal margin** (typically 1–2 cm) while preserving the anal sphincter complex. **Why Abdominoperineal Resection (APR) is correct:** In this patient, the tumor is located **3.5 cm from the anal verge**. In the lower rectum (0–5 cm from the anal verge), a tumor of this size (4 cm) leaves insufficient space to achieve an oncologically safe distal margin (minimum 1–2 cm) and a functional anastomosis without compromising the internal and external anal sphincters. Therefore, **Abdominoperineal Resection (Miles' Operation)** is the treatment of choice. It involves the permanent removal of the rectum, anus, and sphincters, resulting in a permanent end-sigmoid colostomy. **Why the other options are incorrect:** * **Anterior Resection (AR):** This is indicated for tumors in the upper rectum (>10 cm from the anal verge). For middle and lower rectal tumors where the sphincter can be saved, a **Low Anterior Resection (LAR)** is performed. Here, the tumor is too low for a safe LAR. * **Colostomy:** A standalone colostomy is a palliative procedure for inoperable, obstructing tumors. It does not treat the primary malignancy. * **Defunctioning Anastomosis:** This is a surgical step (usually a loop ileostomy) performed to protect a low colorectal anastomosis from leaking; it is not a primary treatment for the tumor itself. ### **High-Yield Clinical Pearls for NEET-PG** * **Distance Rule:** * Upper Rectum (>10 cm): Anterior Resection. * Middle Rectum (5–10 cm): Low Anterior Resection (LAR). * Lower Rectum (<5 cm): Abdominoperineal Resection (APR) or Ultra-low LAR if a 1 cm margin is possible. * **Safe Distal Margin:** Traditionally 5 cm, but currently accepted as **2 cm** for most rectal cancers and **1 cm** for low-grade/distal tumors. * **TME:** Total Mesorectal Excision is the "gold standard" surgical technique for rectal cancer to reduce local recurrence. * **Investigation of Choice:** **MRI Rectum** (for local staging/T-stage) and **Rigid Proctosigmoidoscopy** (for accurate distance measurement).

Question 155: Carcinoma of the right colon commonly presents as:

A. Ulcerating lesion
B. Fungating lesion (Correct Answer)
C. Stenosing lesion
D. Infiltrating lesion

Explanation: **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).

Question 156: What is the recommended margin of clearance for anal carcinoma?

A. 2 cm (Correct Answer)
B. 3 cm
C. 4 cm
D. 5 cm

Explanation: **Explanation:** The management of anal carcinoma (specifically squamous cell carcinoma) has evolved significantly. While the primary treatment is the **Nigro Protocol** (chemoradiotherapy), surgical excision is indicated for small, well-differentiated tumors (T1) located in the perianal skin or anal margin. **1. Why 2 cm is correct:** For tumors of the anal margin, a **wide local excision with a 2 cm lateral margin** is the standard of care. This margin is sufficient to ensure complete histological clearance (R0 resection) while preserving the function of the anal sphincter complex. A 2 cm margin balances the need for oncological safety with the prevention of fecal incontinence. **2. Why the other options are incorrect:** * **3 cm and 4 cm:** These margins are unnecessarily wide for anal margin tumors. Excising this much tissue often necessitates complex reconstructive flaps and significantly increases the risk of damaging the external anal sphincter, leading to poor functional outcomes without providing a proven survival benefit. * **5 cm:** This margin is typically associated with radical surgeries like Abdominoperineal Resection (APR) for rectal cancers or very large skin malignancies, but it is not the standard recommendation for localized anal margin carcinoma. **Clinical Pearls for NEET-PG:** * **Anal Canal vs. Anal Margin:** Tumors of the **anal canal** (proximal to the dentate line) are treated with **chemoradiotherapy**. Tumors of the **anal margin** (distal to the dentate line) can be treated with **wide local excision** if they are <2 cm and do not involve the sphincter. * **Nigro Protocol:** Consists of 5-Fluorouracil (5-FU), Mitomycin-C, and Radiotherapy. * **Salvage Surgery:** Abdominoperineal Resection (APR) is reserved for persistent or recurrent disease after chemoradiotherapy. * **Lymphatic Spread:** Anal canal tumors above the dentate line drain to internal iliac nodes; those below (anal margin) drain to **superficial inguinal nodes**.

Question 157: All of the following are true about Gardner's Syndrome except:

A. Autosomal dominant inheritance.
B. Associated sebaceous cysts are seen.
C. Development of hamartomatous polyps in the duodenum.
D. Polyps rarely undergo malignant transformation. (Correct Answer)

Explanation: **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).

Question 158: Full bowel preparation is avoided in which of the following conditions?

A. Carcinoma of the colon (Correct Answer)
B. Hirschsprung disease
C. Ulcerative colitis
D. Irritable bowel syndrome

Explanation: **Explanation:** The correct answer is **Carcinoma of the colon**. **Why Carcinoma of the colon is the correct answer:** In cases of colonic malignancy, the primary concern is **intestinal obstruction**. Administering a full mechanical bowel preparation (MBP)—which typically involves large volumes of osmotic laxatives like Polyethylene Glycol (PEG)—in a patient with a potentially obstructing lesion can lead to "proximal loading." This increases intraluminal pressure, potentially causing **acute-on-chronic obstruction** or even **perforation**. Modern surgical practice (ERAS protocols) also suggests that for elective colonic resections, mechanical prep may be omitted or limited to a "clear liquid diet" as it can cause dehydration and electrolyte imbalances without significantly reducing surgical site infections. **Analysis of incorrect options:** * **Hirschsprung disease:** While full MBP is difficult due to the aganglionic segment, it is not strictly avoided; rather, it is performed using repeated rectal washouts and irrigations to decompress the megacolon before surgery. * **Ulcerative colitis:** While MBP is used cautiously during acute flares to avoid precipitating toxic megacolon, it is standard practice before elective total proctocolectomy. * **Irritable bowel syndrome (IBS):** This is a functional disorder with no structural obstruction. MBP is safe and frequently used if these patients undergo colonoscopy for screening. **Clinical Pearls for NEET-PG:** * **Golden Rule:** Never give oral purgatives to a patient with suspected intestinal obstruction. * **ERAS Guidelines:** Mechanical bowel preparation alone does not reduce leak rates; however, the combination of **MBP + Oral Antibiotics** is currently favored for elective colorectal surgery to reduce surgical site infections. * **Subtotal Colectomy:** In emergency settings for obstructing left-sided colon cancer, a subtotal colectomy with ileorectal anastomosis is often preferred over MBP to avoid the risks of "on-table" irrigation.

Question 159: A 22-year-old male presents with a family history of colorectal adenocarcinoma in his father. What is a possible diagnosis given this information?

A. Turcot syndrome
B. Peutz-Jeghers syndrome
C. Cowden's disease
D. Gardner's syndrome (Correct Answer)

Explanation: **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)**.

Question 160: What is the mode of inheritance for Gardner syndrome?

A. Autosomal recessive
B. Autosomal dominant (Correct Answer)
C. X-linked
D. None of the above

Explanation: **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.

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