Colorectal Surgery — MCQs

Colorectal Surgery Indian Medical PG Practice Questions and MCQs

Question 71: What is the primary aim of surgery in carcinoma of the rectum?

A. Limited excision of the rectum
B. Sacrificing gastrointestinal continuity
C. Preserving the anal sphincter (Correct Answer)
D. Preserving the mesorectum

Explanation: **Explanation:** The primary goal of modern rectal cancer surgery is to achieve an **oncologically safe resection while maintaining the best possible quality of life**. Historically, many rectal cancers were treated with Abdominoperineal Resection (APR), resulting in a permanent stoma. However, with advancements in surgical techniques like **Total Mesorectal Excision (TME)** and improved stapling devices, **preserving the anal sphincter (Option C)** has become the primary aim whenever a distal margin of at least 1–2 cm can be achieved. This allows for restoration of gastrointestinal continuity and avoids the psychological and physical morbidity of a permanent colostomy. **Analysis of Incorrect Options:** * **Option A:** Limited excision is incorrect because rectal cancer requires a radical resection (TME) to remove the primary tumor along with its lymphatic drainage to prevent local recurrence. * **Option B:** Sacrificing continuity (permanent stoma) is now considered a last resort, reserved only for tumors involving the levator ani or external sphincter where a safe margin cannot be obtained. * **Option D:** Preserving the mesorectum is surgically incorrect. The **mesorectum must be excised** entirely (TME) because it contains the lymph nodes and vascular supply where micrometastases often reside. **NEET-PG High-Yield Pearls:** * **Gold Standard:** Total Mesorectal Excision (TME) is the standard of care for middle and lower rectal cancers. * **Distal Margin:** A 2 cm distal clearance is traditional, but 1 cm is now considered acceptable for low-grade tumors to facilitate sphincter preservation. * **Level of Lesion:** Lesions >6 cm from the anal verge are usually amenable to Low Anterior Resection (LAR), while very low lesions (<5 cm) may require Ultra-low AR or APR.

Question 72: Which of the following statements is NOT true about hemorrhoids?

A. First-degree hemorrhoids do not prolapse.
B. Excision is a treatment option for external and internal hemorrhoids.
C. Third-degree hemorrhoids do not require surgery. (Correct Answer)
D. Conservative treatment is indicated for first-degree hemorrhoids.

Explanation: ### Explanation Hemorrhoids are vascular cushions located in the anal canal. Understanding the classification and management of internal hemorrhoids is high-yield for NEET-PG. **Why Option C is the correct answer (False statement):** Internal hemorrhoids are graded based on the degree of prolapse (Goligher’s Classification). **Third-degree hemorrhoids** are defined as cushions that prolapse beyond the dentate line and require **manual reduction**. While initial management may be conservative, many patients with third-degree hemorrhoids fail non-operative therapy and **do require surgical intervention** (e.g., Stapled Hemorrhoidopexy or Open/Closed Hemorrhoidectomy) to achieve symptomatic relief. **Analysis of Incorrect Options (True statements):** * **Option A:** First-degree hemorrhoids bleed but **do not prolapse** out of the anal canal. * **Option B:** Excision (Hemorrhoidectomy) is the definitive treatment for symptomatic **external** hemorrhoids (especially if thrombosed) and high-grade **internal** hemorrhoids (Grades III and IV). * **Option D:** Conservative management (high-fiber diet, stool softeners, and sitz baths) is the **first-line treatment** for Grade I and early Grade II hemorrhoids. **High-Yield Clinical Pearls for NEET-PG:** * **Primary positions:** 3, 7, and 11 o'clock (Lithotomy position). * **Grade I:** Bleeding only, no prolapse. * **Grade II:** Prolapse on straining but **reduces spontaneously**. * **Grade III:** Prolapse requires **manual reduction**. * **Grade IV:** Permanent prolapse; **irreducible**. * **Treatment of choice for Grade II:** Rubber Band Ligation (RBL). * **Treatment of choice for Grade IV:** Surgical Hemorrhoidectomy (Milligan-Morgan or Ferguson technique).

Question 73: What is the most common type of carcinoma of the right colon?

A. Stenosing
B. Ulcerative (Correct Answer)
C. Tubular
D. Fungating

Explanation: **Explanation:** The correct answer is **B. Ulcerative**. In colorectal surgery, the morphology of colon cancer varies significantly based on its anatomical location. Carcinomas of the **right colon** (caecum and ascending colon) most commonly present as **ulcerative** lesions. While these tumors can also be large and cauliflower-like (fungating), the ulcerative type is statistically the most frequent presentation. Because the right colon has a large caliber and the fecal matter is liquid, these tumors rarely cause obstruction early on; instead, they tend to bleed chronically, leading to iron-deficiency anemia. **Analysis of Options:** * **A. Stenosing:** This is the characteristic morphology of the **left colon** (descending and sigmoid). These "napkin-ring" or "apple-core" lesions lead to luminal narrowing and early intestinal obstruction. * **C. Tubular:** This refers to a histological growth pattern (tubular adenocarcinoma) rather than a gross morphological type. While common microscopically, it is not the answer for gross appearance. * **D. Fungating:** Also known as exophytic or cauliflower-like growths. While common in the right colon (especially the caecum), they are second to the ulcerative type in overall frequency. **NEET-PG High-Yield Pearls:** * **Right-sided tumors:** Present with **anemia**, occult blood in stools, and a palpable mass in the right iliac fossa. * **Left-sided tumors:** Present with **altered bowel habits** and features of intestinal obstruction. * **Most common site** of colorectal cancer overall: **Rectum**, followed by the Sigmoid colon. * **Most common histological type:** Adenocarcinoma.

Question 74: Which of the following is NOT an abdominal procedure for rectal prolapse?

A. Altmeir's procedure (Correct Answer)
B. Well's operation
C. Lahaul's operation
D. Ripstein's sling operation

Explanation: The management of rectal prolapse is broadly classified into **Abdominal** and **Perineal** procedures. The choice depends on the patient's age, comorbidities, and fitness for general anesthesia. ### **Explanation of the Correct Answer** **A. Altmeier’s Procedure (Perineal Proctosigmoidectomy):** This is a **perineal procedure**, not an abdominal one. It involves a full-thickness excision of the prolapsed rectum and redundant sigmoid colon through the perineum, followed by a coloanal anastomosis. It is typically preferred for elderly or high-risk patients who cannot tolerate a major abdominal surgery. ### **Analysis of Incorrect Options (Abdominal Procedures)** All other options are abdominal procedures, which generally have lower recurrence rates compared to perineal approaches: * **B. Wells’ Operation (Posterior Rectopexy):** An abdominal procedure where the rectum is mobilized and fixed to the sacral promontory using a synthetic mesh (Ivalon sponge) placed posteriorly. * **C. Lahaut’s Operation:** An abdominal procedure involving an anterior rectopexy combined with a subtotal colectomy or sigmoid resection. * **D. Ripstein’s Sling Operation:** An abdominal procedure where the rectum is fully mobilized and fixed to the sacrum using a mesh sling that encircles the rectum anteriorly. ### **High-Yield Clinical Pearls for NEET-PG** * **Gold Standard:** Abdominal **Laparoscopic Ventral Rectopexy (LVR)** is currently the preferred abdominal approach due to lower recurrence and fewer autonomic nerve injuries. * **Delorme’s Procedure:** Another common **perineal** procedure involving mucosal stripping and plication of the rectal muscle (used for short-segment prolapse). * **Thiersch Wiring:** A historical perineal procedure (anal encirclement) used for palliative management in very frail patients. * **Recurrence:** Abdominal procedures have a lower recurrence rate (~5-10%) compared to perineal procedures (~15-20%).

Question 75: What is the most common neoplasm of the appendix?

A. Lymphoma
B. Adenocarcinoma
C. Leiomyosarcoma
D. Argentaffinoma (Correct Answer)

Explanation: **Explanation:** The most common neoplasm of the appendix is the **Carcinoid tumor**, also known as an **Argentaffinoma**. These are neuroendocrine tumors (NETs) derived from subepithelial neuroendocrine cells (Kulchitsky cells). They are typically discovered incidentally during appendectomies performed for suspected acute appendicitis. Most appendiceal carcinoids are located at the **tip of the appendix** and are usually less than 1 cm in size. **Analysis of Options:** * **D. Argentaffinoma (Correct):** This is the historical name for carcinoid tumors because they stain with silver salts (argentaffin-positive). They account for approximately 50–85% of all appendiceal neoplasms. * **A. Lymphoma:** While the appendix contains significant lymphoid tissue (GALT), primary lymphoma of the appendix is rare, accounting for only 1–3% of appendiceal tumors. * **B. Adenocarcinoma:** This is the most common *malignant* primary tumor of the appendix after carcinoids, but it is significantly less frequent. It often presents like acute appendicitis in older patients. * **C. Leiomyosarcoma:** This is an extremely rare mesenchymal tumor of the smooth muscle layer of the appendix. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site for Carcinoid:** Appendix (overall), followed by the ileum and rectum. * **Management:** For tumors **<1 cm**, a simple appendectomy is sufficient. For tumors **>2 cm** or those involving the base/mesoappendix, a **Right Hemicolectomy** is indicated. * **Carcinoid Syndrome:** Rarely occurs with appendiceal carcinoids unless there are extensive liver metastases, as the liver metabolizes vasoactive substances (like Serotonin) before they reach systemic circulation.

Question 76: Which of the following statements are true about neoplastic colorectal polyps?

A. Sessile polyps greater than 1 cm are malignant.
B. The most common site for neoplastic colorectal polyps is the colon and rectum. (Correct Answer)
C. Adenomatous polyps are premalignant.
D. Tubular adenomas are malignant.

Explanation: **Explanation:** **1. Why Option B is Correct:** Neoplastic colorectal polyps (adenomas) are the most common precursors to colorectal cancer. By definition, these polyps arise from the glandular epithelium of the large intestine. Therefore, the **colon and rectum** are the primary and most common sites for these lesions. In the general population, the prevalence of these polyps increases with age, particularly after 50 years. **2. Why the Other Options are Incorrect:** * **Option A:** While size is a predictor of malignancy risk, a sessile polyp >1 cm is **not automatically malignant**. However, polyps >2 cm have a significantly higher risk (up to 35-50%) of containing invasive carcinoma. * **Option C:** This statement is actually **clinically true** (Adenomatous polyps are indeed premalignant via the adenoma-carcinoma sequence). However, in the context of this specific question's construction, Option B is often cited as the definitive anatomical fact regarding their distribution. *Note: In many standard texts, both B and C are factual, but B defines the entity's location.* * **Option D:** Tubular adenomas are **benign** neoplastic polyps. While they have malignant potential, they are not "malignant" by definition. Villous adenomas have a much higher risk of harboring cancer compared to tubular adenomas. **High-Yield Clinical Pearls for NEET-PG:** * **Adenoma-Carcinoma Sequence:** Takes approximately 7–10 years. * **Risk Factors for Malignancy in Polyps:** Size >2 cm, Villous histology (highest risk), and High-grade dysplasia. * **Management:** All identified adenomatous polyps should be removed (polypectomy) to prevent progression to adenocarcinoma. * **Screening:** Colonoscopy is the gold standard for both detection and therapeutic excision.

Question 77: Which of the following is a complication of diverticulitis?

A. Carcinoma of the colon
B. Extraintestinal manifestations such as arthritis, iritis, and skin rashes
C. Fistulation to adjacent organs such as the bladder, with ensuing colovesical fistula (Correct Answer)
D. Arteriovenous fistulae of the intestine

Explanation: **Explanation:** Diverticulitis occurs when a colonic diverticulum (typically in the sigmoid colon) becomes inflamed or perforated. This inflammatory process can lead to several complications, categorized by the **Hinchey Classification**. **1. Why Option C is Correct:** When an inflamed diverticulum adheres to an adjacent organ, the inflammation can erode through the walls, creating an abnormal communication or **fistula**. The most common site is the bladder (**colovesical fistula**), presenting clinically as pneumaturia (air in urine) or fecaluria. Other sites include the vagina (colovaginal) or the skin (colocutaneous). **2. Why Other Options are Incorrect:** * **Option A:** Diverticulitis is an inflammatory condition and is **not** a premalignant state. While both diverticulitis and colon cancer are common in older populations and may coexist, one does not cause the other. * **Option B:** Extraintestinal manifestations (arthritis, uveitis, erythema nodosum) are characteristic of **Inflammatory Bowel Disease (IBD)**, specifically Crohn’s disease and Ulcerative Colitis, not diverticulitis. * **Option C:** Arteriovenous (AV) malformations or angiodysplasias are distinct vascular lesions. While they are a common cause of painless lower GI bleeding, they are unrelated to the inflammatory process of diverticulitis. **High-Yield Clinical Pearls for NEET-PG:** * **Investigation of Choice:** Contrast-enhanced CT (CECT) of the abdomen is the gold standard for acute diverticulitis. * **Contraindications:** Colonoscopy and Barium Enema are **strictly contraindicated** in the acute phase due to the high risk of perforation. * **Most Common Site:** Sigmoid colon (due to high intraluminal pressure). * **Most Common Fistula:** Colovesical fistula (presents with recurrent UTIs and pneumaturia).

Question 78: All are endoscopic modalities of treatment of chronic radiation proctitis, EXCEPT:

A. Bipolar electrocoagulation
B. Laser therapy
C. Argon plasma coagulation
D. Ligation therapy (Correct Answer)

Explanation: **Explanation:** Chronic radiation proctitis (CRP) is characterized by **obliterative endarteritis**, which leads to tissue ischemia and the subsequent formation of fragile, superficial **telangiectasias**. These neovessels are prone to recurrent bleeding. The primary goal of endoscopic treatment is the ablation of these vascular lesions. **Why Ligation Therapy is the Correct Answer:** * **Ligation therapy (Option D)** is typically used for internal hemorrhoids or esophageal varices. It involves banding discrete tissue masses. In CRP, the pathology consists of diffuse, flat mucosal telangiectasias rather than focal protrusions. Therefore, ligation is not a recognized or effective modality for treating the diffuse vascular changes of radiation proctitis. **Analysis of Incorrect Options (Ablative Modalities):** * **Argon Plasma Coagulation (APC) (Option C):** This is the **current gold standard** and most commonly used treatment. It is a non-contact thermal method that allows for uniform, superficial coagulation of telangiectasias with a low risk of perforation. * **Bipolar Electrocoagulation (Option A):** This is a contact thermal method. It is effective but carries a slightly higher risk of deep tissue injury and ulceration compared to APC. * **Laser Therapy (Option B):** Nd:YAG or KTP lasers were historically used to ablate vessels. While effective, they are expensive and have largely been replaced by APC due to the latter's superior safety profile and ease of use. **NEET-PG High-Yield Pearls:** * **Pathology:** Obliterative endarteritis → Ischemia → Neovascularization (Telangiectasia). * **Clinical Presentation:** Painless rectal bleeding occurring months to years (usually 6–24 months) after pelvic radiotherapy (e.g., for prostate or cervical cancer). * **First-line Medical Management:** Sucralfate enemas (more effective than steroid enemas). * **Endoscopic Treatment of Choice:** Argon Plasma Coagulation (APC). * **Formalin Application:** 4% Formalin (topical/endoscopic) is an alternative for refractory cases, acting via chemical cauterization.

Question 79: True about melanoma of the anal canal?

A. Usually presents as anal bleeding (Correct Answer)
B. Abdominoperineal resection gives better results than local excision
C. Local recurrence at the same site after resection
D. Is radiosensitive

Explanation: **Explanation:** Anorectal melanoma is a rare but highly aggressive malignancy, accounting for less than 1% of all anorectal cancers. Despite its rarity, it is the third most common site for melanoma after the skin and eyes. **1. Why Option A is Correct:** The most common presenting symptom of anal melanoma is **rectal bleeding** (seen in up to 80% of cases). Patients often present with a mass, pain, or tenesmus. Because it frequently presents as a dark, protruding mass, it is often misdiagnosed as prolapsed internal hemorrhoids, leading to delays in treatment. **2. Why Other Options are Incorrect:** * **Option B:** Historically, Abdominoperineal Resection (APR) was preferred, but current evidence shows that **Wide Local Excision (WLE)** provides similar survival rates with significantly less morbidity. APR is now reserved only for bulky tumors where WLE cannot achieve clear margins or for palliative salvage. * **Option C:** While recurrence is common, it is typically **systemic (distant metastasis)** rather than isolated local recurrence. Most patients die from distant spread (liver, lungs, bone) regardless of the type of local surgical control. * **Option D:** Melanoma is notoriously **radioresistant**. While radiotherapy may be used for palliation or local control in specific cases, it is not a primary curative modality. **High-Yield Clinical Pearls for NEET-PG:** * **Amelanotic variant:** Up to 30–70% of anal melanomas are non-pigmented (amelanotic), making histological diagnosis via S-100, HMB-45, or Mart-1 stains essential. * **Prognosis:** Extremely poor, with a 5-year survival rate of less than 10–15%. * **Spread:** Early lymphatic spread to inguinal and mesenteric nodes and early hematogenous spread are characteristic.

Question 80: Which of the following is true regarding cancer of the colon?

A. Obstructive features are more common with right-sided colon cancer.
B. 40% of cases at presentation show liver metastasis.
C. Resection is possible in 25% of cases.
D. None of the above. (Correct Answer)

Explanation: This question tests the clinical presentation and epidemiology of colorectal cancer, a high-yield topic for NEET-PG. ### **Explanation of Options** * **Option A (Incorrect):** Obstructive features are more common in **left-sided** colon cancer. The left colon has a narrower lumen, and the stool is more solid. Additionally, left-sided tumors tend to be annular/infiltrative ("napkin-ring" appearance). In contrast, right-sided tumors are usually large, exophytic masses that present with occult bleeding and iron deficiency anemia because the right colon has a wider diameter and liquid contents. * **Option B (Incorrect):** While the liver is the most common site of hematogenous spread, approximately **15–25%** of patients have synchronous liver metastases at the time of presentation, not 40%. * **Option C (Incorrect):** With modern surgical techniques and staging, resection (curative or palliative) is possible in the vast majority of cases (**70–80%**), far exceeding the 25% mentioned. ### **Why "None of the above" is Correct** All statements provided are factually inaccurate based on standard surgical textbooks (Bailey & Love/Sabiston). ### **NEET-PG High-Yield Pearls** * **Most common site:** Rectum > Sigmoid colon. * **Most common presentation:** Change in bowel habits (overall); Anemia (Right-sided); Obstruction (Left-sided). * **Staging:** Contrast-Enhanced CT (CECT) of the Abdomen and Chest is the investigation of choice for staging. * **Tumor Marker:** CEA (Carcinoembryonic Antigen) is used for **monitoring recurrence**, not for screening or primary diagnosis. * **Genetic Pathways:** Most sporadic cases follow the **APC-adenoma-carcinoma sequence** (Chromosomal instability pathway).

Practice by Chapter

Colorectal Anatomy and Physiology

Practice Questions

Diverticular Disease

Practice Questions

Inflammatory Bowel Disease

Practice Questions

Colorectal Polyps

Practice Questions

Colorectal Cancer

Practice Questions

Anorectal Abscess and Fistula

Practice Questions

Hemorrhoids

Practice Questions

Rectal Prolapse

Practice Questions

Fecal Incontinence

Practice Questions

Intestinal Stomas Creation and Management

Practice Questions

Pelvic Floor Disorders

Practice Questions

Enhanced Recovery After Colorectal Surgery

Practice Questions

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