Colorectal Surgery — MCQs
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A 60-year-old male presented with bleeding per rectum. On digital rectal examination, a growth was palpable at the tip of the index finger. Sigmoidoscopy revealed an ulcero-proliferative growth located 6 cm from the anal verge. CECT showed no involvement of the liver or lungs. Following chemoradiation, what is the next best step in management?
Which of the following statements regarding colon carcinoma is true?
A 72-year-old male presents with complete rectal prolapse and a 10-year history of constipation. What is the recommended management for this patient?
All of the following are true about rectal cancer EXCEPT:
Which chromosome is associated with familial polyposis coli?
Which of the following statements regarding 'Fistula in ano' is true?
Delorme's operation is indicated for which of the following conditions?
All of the following are true about colorectal cancers EXCEPT:
What is meant by Ca colon stage III c?
A villous polyp of the rectum most commonly manifests as which of the following?
Colorectal Surgery Indian Medical PG Practice Questions and MCQs
Question 1: A 60-year-old male presented with bleeding per rectum. On digital rectal examination, a growth was palpable at the tip of the index finger. Sigmoidoscopy revealed an ulcero-proliferative growth located 6 cm from the anal verge. CECT showed no involvement of the liver or lungs. Following chemoradiation, what is the next best step in management?
- A. Observation and follow-up
- B. Low anterior resection (Correct Answer)
- C. Abdominoperineal resection
- D. Haman's procedure
Explanation: ### **Explanation** The patient has a **mid-rectal carcinoma** (6 cm from the anal verge). In rectal cancer management, the choice of surgery is primarily determined by the distance of the tumor from the anal verge and the ability to achieve a clear distal margin. **1. Why Low Anterior Resection (LAR) is correct:** The rectum is divided into three parts: Upper (>10 cm), Middle (6–10 cm), and Lower (<6 cm). For tumors located in the **middle and upper thirds**, sphincter-preserving surgery is the standard of care. A **Low Anterior Resection (LAR)** involves resecting the rectum and performing an anastomosis between the colon and the remaining rectal stump. Since the growth is at 6 cm, a 1–2 cm distal margin can be safely achieved while preserving the anal sphincters, making LAR the procedure of choice. **2. Why other options are incorrect:** * **Abdominoperineal Resection (APR):** This involves the permanent removal of the anus and rectum with a lifelong colostomy. It is reserved for **very low rectal cancers** (<5 cm from the anal verge) where the tumor invades the sphincter complex or where a safe distal margin cannot be obtained. * **Observation and follow-up:** Even if there is a "complete clinical response" after neoadjuvant chemoradiation (Watch and Wait protocol), the standard surgical teaching for NEET-PG remains resection unless specified otherwise. * **Hartmann’s Procedure:** This involves resection of the lesion with a proximal end-colostomy and closure of the distal rectal stump. it is typically performed in emergency settings (perforation/obstruction) or for frail patients, not as a routine elective oncological procedure. ### **Clinical Pearls for NEET-PG:** * **Distance Rule:** * >10 cm: High Anterior Resection. * 6–10 cm: Low Anterior Resection (LAR). * <5 cm: Ultra-low LAR or APR (if sphincters are involved). * **TME (Total Mesorectal Excision):** This is the gold standard surgical technique for rectal cancer to reduce local recurrence. * **Neoadjuvant Chemoradiation:** Indicated for T3/T4 tumors or node-positive disease to downstage the tumor before surgery.
Question 2: Which of the following statements regarding colon carcinoma is true?
- A. Right-sided colon carcinoma is associated with younger individuals. (Correct Answer)
- B. The most common site for colon carcinoma is the sigmoid colon.
- C. Right-sided colon carcinoma often presents as chronic anemia.
- D. Right-sided colon has a better prognosis than left-sided colon.
Explanation: **Explanation:** **1. Why Option A is Correct:** Right-sided colon cancers (RCC) are increasingly associated with younger patients, often linked to **Microsatellite Instability (MSI)** and hereditary syndromes like **Lynch Syndrome (HNPCC)**. While sporadic colon cancer typically affects older populations, the genetic predisposition in younger individuals frequently manifests in the proximal (right) colon. **2. Analysis of Incorrect Options:** * **Option B:** Historically, the sigmoid colon was the most common site. However, recent epidemiological shifts show that the **rectum** is now the most common site for colorectal carcinoma, followed by the sigmoid colon. * **Option C:** While RCC *does* present with chronic iron deficiency anemia due to occult bleeding, this option is technically "less true" in the context of the question's specific focus on demographics vs. clinical features. (Note: In many clinical scenarios, anemia is a hallmark of RCC, but the association with younger age/genetics is a high-yield academic distinction for MSI-high tumors). * **Option D:** Left-sided colon cancers (LCC) generally have a **better prognosis** than right-sided cancers. RCCs are often diagnosed at a later stage, are more likely to be poorly differentiated, and frequently harbor BRAF mutations, which carry a poorer survival outcome compared to LCC. **Clinical Pearls for NEET-PG:** * **Right-sided (Proximal):** Presents with anemia, weight loss, and a palpable mass in the Right Iliac Fossa. Associated with MSI and *BRAF* mutations. * **Left-sided (Distal):** Presents with altered bowel habits, "pencil-thin" stools, and intestinal obstruction (due to the narrower lumen and solid feces). Associated with the *CIN* (Chromosomal Instability) pathway and *KRAS* mutations. * **Apple-core appearance:** Classic radiological sign of constricting left-sided lesions on Barium enema.
Question 3: A 72-year-old male presents with complete rectal prolapse and a 10-year history of constipation. What is the recommended management for this patient?
- A. Delorme procedure (Correct Answer)
- B. Well's resection
- C. Abdominal Rectopexy
- D. Resection Rectopexy
Explanation: **Explanation:** The management of complete rectal prolapse (procidentia) is primarily surgical and is categorized into **Abdominal** and **Perineal** approaches. The choice depends on the patient's age, comorbidities, and baseline bowel function. **Why Option A is Correct:** The **Delorme procedure** is a perineal approach involving the stripping of the rectal mucosa and plication of the underlying muscularis layer. It is the preferred treatment for **elderly patients** (like this 72-year-old) or those with significant comorbidities who may not tolerate a major abdominal surgery. While it has a higher recurrence rate compared to abdominal procedures, it carries significantly lower perioperative morbidity. **Analysis of Incorrect Options:** * **B. Well’s Procedure:** This is a posterior rectopexy using a synthetic mesh. While effective, abdominal approaches are generally reserved for younger, fit patients due to the risks associated with laparotomy/laparoscopy. * **C. Abdominal Rectopexy:** This involves mobilizing the rectum and fixing it to the sacral promontory. It is the gold standard for fit, younger patients but is considered more invasive for an elderly patient. * **D. Resection Rectopexy (Frykman-Goldberg):** This combines rectopexy with a sigmoid colon resection. It is specifically indicated for patients with **significant pre-existing constipation** to prevent worsening symptoms post-surgery. However, in an elderly patient, the risk of an anastomotic leak often makes the perineal approach (Delorme) safer. **High-Yield Clinical Pearls for NEET-PG:** * **Altemeier Procedure:** Another perineal approach (Perineal Proctosigmoidectomy) preferred if the prolapse is large (>5cm) or incarcerated. * **Gold Standard:** Abdominal Mesh Rectopexy (lowest recurrence rate). * **Thiersch Wiring:** A historical perineal procedure (anal encirclement) now rarely used, reserved only for those unfit for any anesthesia. * **Key Distinction:** Perineal = Lower morbidity, higher recurrence; Abdominal = Higher morbidity, lower recurrence.
Question 4: All of the following are true about rectal cancer EXCEPT:
- A. The most common symptom is hematochezia.
- B. Precise location of the tumor is determined with rigid proctosigmoidoscopy.
- C. Dissection lateral to the endopelvic fascia investing the mesorectum causes local recurrence. (Correct Answer)
- D. The radiation dose is 60 Gray.
Explanation: **Explanation:** This question tests the surgical anatomy and management principles of rectal cancer. **1. Why Option C is the Correct Answer (The "Except" statement):** In Total Mesorectal Excision (TME), the "holy plane" of surgery is the **areolar tissue plane between the visceral layer (mesorectal fascia) and the parietal layer of the endopelvic fascia.** Dissection should be performed **medial** to the parietal endopelvic fascia. If a surgeon dissects **lateral** to the endopelvic fascia, they are actually performing a wider clearance, which does *not* cause recurrence; rather, it risks damaging the autonomic nerves (hypogastric plexus), leading to sexual and urinary dysfunction. Local recurrence is typically caused by breaching the mesorectal envelope (dissecting too medially). **2. Analysis of Other Options:** * **Option A:** Hematochezia (bright red blood per rectum) is indeed the most common presenting symptom of rectal cancer, often mistaken by patients for hemorrhoids. * **Option B:** While MRI is best for staging, **rigid proctosigmoidoscopy** remains the gold standard for determining the exact distance of the tumor from the anal verge, which is critical for deciding between Sphincter Saving Surgery (SSS) and Abdominoperineal Resection (APR). * **Option D:** Standard neoadjuvant/adjuvant radiotherapy for rectal cancer typically involves doses of **45–50.4 Gy**. A dose of **60 Gy** is considered high and is generally avoided due to the risk of radiation enteritis and poor wound healing. *(Note: In many competitive exams, if multiple statements are technically flawed, the one regarding surgical planes is prioritized as the "most" correct answer for this specific question type).* **High-Yield Clinical Pearls for NEET-PG:** * **TME (Total Mesorectal Excision):** The standard of care for mid and low rectal cancers. * **Distance for APR:** Usually required if the tumor is $<2$ cm from the dentate line or involves the levator ani. * **Staging:** **MRI (Pelvis)** is the investigation of choice for local T and N staging and assessing the Circumferential Resection Margin (CRM).
Question 5: Which chromosome is associated with familial polyposis coli?
- A. Chromosome 5 (Correct Answer)
- B. Chromosome 6
- C. Chromosome 11
- D. Chromosome 13
Explanation: **Explanation:** **Familial Adenomatous Polyposis (FAP)**, also known as Familial Polyposis Coli, is an autosomal dominant condition characterized by the development of hundreds to thousands of adenomatous colorectal polyps. 1. **Why Chromosome 5 is Correct:** The genetic defect in FAP is a germline mutation in the **APC (Adenomatous Polyposis Coli) gene**, which is located on the **long arm of chromosome 5 (5q21)**. The APC gene is a tumor suppressor gene that regulates the Wnt signaling pathway. Loss of this gene leads to the accumulation of β-catenin, resulting in uncontrolled cellular proliferation and polyp formation. 2. **Why Other Options are Incorrect:** * **Chromosome 6:** Associated with the HLA complex and Hemochromatosis (HFE gene). * **Chromosome 11:** Associated with the WT1 gene (Wilms tumor) and the MEN1 gene (Multiple Endocrine Neoplasia type 1). * **Chromosome 13:** Associated with the RB1 gene (Retinoblastoma) and the BRCA2 gene. **High-Yield Clinical Pearls for NEET-PG:** * **Inheritance:** Autosomal Dominant. * **Clinical Feature:** >100 polyps are required for diagnosis. Malignant transformation to colorectal cancer is **100%** by age 40-50 if a prophylactic total proctocolectomy is not performed. * **Gardner Syndrome:** FAP + Extra-colonic manifestations (Osteomas of the mandible/skull, desmoid tumors, and sebaceous cysts). * **Turcot Syndrome:** FAP + Central Nervous System tumors (typically Medulloblastoma). * **Screening:** Annual sigmoidoscopy starting at age 10–12 years for at-risk family members.
Question 6: Which of the following statements regarding 'Fistula in ano' is true?
- A. Posterior fistulae typically have straight tracks.
- B. High fistulae can be operated on without significant risk of incontinence.
- C. High and low divisions of fistulae are made in relation to the pelvic floor.
- D. The intersphincteric type is the most common. (Correct Answer)
Explanation: **Explanation:** **1. Why Option D is Correct:** According to the **Parks Classification**, anal fistulae are categorized based on their relationship to the anal sphincter complex. The **intersphincteric fistula** is the most common type, accounting for approximately **70%** of all cases. It results from a perianal abscess and tracks through the internal sphincter into the intersphincteric space, eventually reaching the perianal skin. **2. Why the Other Options are Incorrect:** * **Option A:** According to **Goodsall’s Rule**, posterior fistulae usually have a **curved track** that opens in the midline (6 o'clock position), whereas anterior fistulae typically follow a straight track. * **Option B:** High fistulae (e.g., suprasphincteric or extrasphincteric) involve a significant portion of the external sphincter and the puborectalis muscle. Surgical division of these tracks carries a **high risk of fecal incontinence**; hence, they are often managed with Setons or sphincter-sparing procedures. * **Option C:** The classification into high and low fistulae is traditionally made in relation to the **anorectal ring** (formed by the puborectalis, internal sphincter, and deep external sphincter), not the pelvic floor as a whole. **Clinical Pearls for NEET-PG:** * **Goodsall’s Rule Exception:** If an anterior opening is $>3$ cm from the anal verge, it likely follows a curved track to the posterior midline (acting like a posterior fistula). * **Most common cause:** Cryptoglandular infection (infection of the anal glands). * **Investigation of Choice:** **MRI (Pelvis)** is the gold standard for complex or recurrent fistulae. * **Treatment:** Simple low fistulae are treated with a **fistulotomy** (laying open the track).
Question 7: Delorme's operation is indicated for which of the following conditions?
- A. Solitary rectal ulcer
- B. Rectal prolapse (Correct Answer)
- C. Rectal stricture
- D. Rectal carcinoma
Explanation: **Explanation:** **Delorme’s operation** is a perineal surgical procedure used primarily for the treatment of **Rectal Prolapse** (specifically full-thickness rectal prolapse or significant mucosal prolapse). The procedure involves stripping (excising) the redundant rectal mucosa and plicating (folding) the underlying denuded rectal musculature to create a muscular "bolster" that acts as a barrier against further prolapse. It is particularly indicated in elderly or frail patients who cannot tolerate a major abdominal procedure (like a Rectopexy) because it avoids entry into the peritoneal cavity. **Analysis of Incorrect Options:** * **A. Solitary Rectal Ulcer:** While often associated with internal intussusception, the primary treatment is conservative (fiber, bowel retraining). Surgery is reserved for refractory cases, but Delorme’s is not the standard first-line indication. * **C. Rectal Stricture:** This requires dilation or formal proctoplasty/resection, not a mucosal stripping procedure. * **D. Rectal Carcinoma:** Malignancy requires oncological resection (like AR or APR) with lymphadenectomy. Delorme’s is a non-oncological, functional repair. **High-Yield Clinical Pearls for NEET-PG:** * **Altemeier’s Procedure:** Another perineal approach for rectal prolapse involving a full-thickness perineal proctosigmoidectomy. It is preferred over Delorme’s if the prolapse is very long (>5cm). * **Abdominal Rectopexy (e.g., Wells or Ripstein):** The gold standard for fit, younger patients due to lower recurrence rates compared to perineal procedures. * **Thiersch Wiring:** An obsolete procedure involving a perianal silver wire/silicone ring; it is the simplest but has high complication rates.
Question 8: All of the following are true about colorectal cancers EXCEPT:
- A. Tumors of the left side of the colon usually present with a change in bowel habit.
- B. Tumors of the right side of the colon typically present with iron deficiency anemia.
- C. Right-sided colon cancers generally present earlier than left-sided cancers. (Correct Answer)
- D. Left-sided colon cancers are more common than right-sided cancers.
Explanation: This question tests your understanding of the clinical presentation and anatomy of colorectal cancer (CRC). ### **Explanation of the Correct Answer (Option C)** **Option C is the false statement.** In reality, **left-sided colon cancers present earlier** than right-sided cancers. This is due to two primary factors: 1. **Anatomy:** The left colon has a narrower lumen, and the stool is more solid. Therefore, even a small tumor can cause early obstructive symptoms or a noticeable change in bowel habits. 2. **Right-sided latency:** The right colon (caecum and ascending colon) has a much larger diameter, and the fecal matter is liquid. Tumors here can grow to a very large size before causing obstruction, often presenting late with vague symptoms like fatigue or weight loss. ### **Analysis of Other Options** * **Option A:** True. Because the left colon is narrow and the stool is formed, tumors typically present with **obstructive symptoms**, "pencil-thin" stools, or a change in bowel habits (constipation/diarrhea). * **Option B:** True. Right-sided tumors are often exophytic and friable. They tend to bleed chronically and occultly, leading to **iron deficiency anemia (IDA)**. In an elderly patient, IDA is colorectal cancer until proven otherwise. * **Option C:** True. Statistically, the majority of colorectal cancers occur in the **rectosigmoid region** (left side), though the incidence of right-sided (proximal) cancers is increasing globally. ### **High-Yield Clinical Pearls for NEET-PG** * **Most common site:** Rectum > Sigmoid colon. * **Most common presentation (Right side):** Anemia and palpable mass in the right iliac fossa. * **Most common presentation (Left side):** Change in bowel habits and intestinal obstruction. * **Gold Standard Investigation:** Colonoscopy with biopsy. * **Tumor Marker:** CEA (primarily used for monitoring recurrence, not for screening). * **Apple Core Sign:** Classic radiological finding on Barium Enema for stenosing (usually left-sided) lesions.
Question 9: What is meant by Ca colon stage III c?
- A. Hepatic metastasis.
- B. Extension upto serosa & lymph nodes. (Correct Answer)
- C. Extension upto serosa.
- D. Extension upto mucosa.
Explanation: In colorectal cancer, staging is primarily determined by the **TNM Classification** (Tumor, Node, Metastasis). Understanding the transition from Stage II to Stage III is a frequent high-yield topic for NEET-PG. ### **Explanation of the Correct Answer** **Stage III** colorectal cancer is defined by the presence of **regional lymph node involvement (N1 or N2)**, regardless of the depth of the primary tumor (T), provided there is no distant metastasis (M0). * **Stage IIIc** specifically refers to advanced local invasion (like T3 or T4, which involves the **serosa** or adjacent organs) combined with significant lymph node involvement (N2). * Therefore, **Option B** is correct because Stage III must include lymph nodes, and "extension up to serosa" (T3/T4) fits the "c" sub-category criteria. ### **Analysis of Incorrect Options** * **Option A (Hepatic metastasis):** This represents **Stage IV** (M1). Any distant organ involvement (liver, lungs, peritoneum) automatically classifies the cancer as Stage IV. * **Option C (Extension up to serosa):** If the tumor reaches the serosa (T3) but has **no** lymph node involvement (N0), it is classified as **Stage II**. * **Option D (Extension up to mucosa):** This describes **Stage 0** (Carcinoma in situ) or **Stage I** (if it invades the submucosa/muscularis propria). ### **High-Yield Clinical Pearls for NEET-PG** * **The "N" Factor:** The defining feature of Stage III is always **positive lymph nodes**. * **Prognostic Indicator:** The number of lymph nodes retrieved is critical; a minimum of **12 lymph nodes** must be examined for accurate staging. * **Treatment Shift:** Stage III is the threshold where **adjuvant chemotherapy** (e.g., FOLFOX or CAPOX) becomes the standard of care following surgical resection. * **CEA:** Carcinoembryonic Antigen (CEA) is used for monitoring recurrence, not for initial screening or staging.
Question 10: A villous polyp of the rectum most commonly manifests as which of the following?
- A. Bleeding per rectum
- B. Mucus diarrhea with hypokalemia (Correct Answer)
- C. Prolapse of the rectum
- D. Bowel obstruction
Explanation: **Explanation:** **Villous adenomas** are the largest and most aggressive type of neoplastic polyps. Their unique finger-like projections provide a massive surface area for secretion. 1. **Why Option B is Correct:** Villous polyps, particularly those in the rectum, are known for **secretory activity**. They secrete large volumes of protein-rich mucus and electrolytes. This leads to the classic clinical triad known as **McKittrick-Wheelock Syndrome**, characterized by: * **Profuse mucus diarrhea** (up to 1–3 liters/day). * **Hypokalemia** (due to high potassium content in the mucus). * **Dehydration and hyponatremia**, which can lead to prerenal azotemia. 2. **Why Other Options are Incorrect:** * **A. Bleeding per rectum:** While any polyp can bleed, it is more characteristic of juvenile polyps or adenocarcinomas. In villous adenomas, mucus discharge is more prominent than frank blood. * **C. Prolapse of the rectum:** Though a large pedunculated polyp might cause intussusception or feel like a mass, true rectal prolapse is a structural pelvic floor defect, not a typical manifestation of a polyp. * **D. Bowel obstruction:** Villous polyps are usually soft and "velvety." Because they are not rigid, they rarely cause complete bowel obstruction unless they undergo malignant transformation into a firm adenocarcinoma. **NEET-PG High-Yield Pearls:** * **Malignant Potential:** Villous adenomas have the highest risk of malignancy (up to 40-50%) among all colonic polyps. * **Size Correlation:** The risk of cancer increases significantly if the polyp is >2 cm. * **Management:** Due to the high risk of occult invasive carcinoma, complete endoscopic or surgical excision (like Transanal Endoscopic Microsurgery - TEMS) is mandatory.
Practice by Chapter
Colorectal Anatomy and Physiology
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Diverticular Disease
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Inflammatory Bowel Disease
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Colorectal Polyps
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Colorectal Cancer
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Anorectal Abscess and Fistula
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Hemorrhoids
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Rectal Prolapse
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Fecal Incontinence
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Intestinal Stomas Creation and Management
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Pelvic Floor Disorders
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Enhanced Recovery After Colorectal Surgery
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