Colorectal Surgery Practice Questions

Q: A complicated case of diverticular disease is defined as diverticula with which of the following complications?

Abscess and perforation. **Explanation:** Diverticular disease exists on a spectrum ranging from asymptomatic presence of pouches to life-threatening complications. The classification into "simple" and "complicated" is based on the presence of secondary pathological processes. **Why the Correct Answer is Right:** **Complicated diverticulitis** (Option B) is defined by the presence of complications beyond simple inflammation of the diverticular wall. According to the **Hinchey Classification**, these include: 1. **Abscess** (localized collection of pus). 2. **Perforation** (leading to purulent or feculent peritonitis). 3. **Fistula** formation (most commonly colovesical). 4. **Stricture** or bowel obstruction. These conditions usually require hospitalization, intravenous antibiotics, or surgical intervention (e.g., Hartmann’s procedure). **Analysis of Incorrect Options:** * **Option A & C:** Abdominal pain (typically LLQ), constipation, and diarrhea are symptoms of **Symptomatic Uncomplicated Diverticular Disease (SUDD)**. These are functional disturbances without structural complications. * **Option D:** While **Diverticular Bleeding** is a serious complication of diverticulosis, it is pathologically distinct from "complicated diverticulitis." Bleeding occurs due to eccentric thinning of the vasa recta and is usually painless, whereas "complicated disease" refers to the inflammatory/infectious sequelae of diverticulitis. **High-Yield Pearls for NEET-PG:** * **Most common site:** Sigmoid colon (due to high intraluminal pressure and smaller caliber). * **Investigation of choice:** **CECT Abdomen** (Contrast-Enhanced CT). * **Contraindication:** Colonoscopy and Barium Enema are strictly contraindicated in the acute phase of diverticulitis due to the high risk of perforation. * **Most common fistula:** Colovesical fistula (presents with pneumaturia and fecaluria).

Q: In Duke's classification of cancer rectum, what does stage B2 denote?

Tumor invades perirectal fat. **Explanation:** The **Dukes’ classification** (modified by Astler and Coller) is a classic staging system for colorectal cancer based on the depth of invasion and nodal involvement. 1. **Why Option C is Correct:** In the **Astler-Coller modification** of Dukes' classification, **Stage B2** specifically denotes a tumor that has extended **through the muscularis propria** and invaded the **perirectal fat (subserosa/serosa)**, but without lymph node involvement. This is a critical prognostic marker as it indicates a T3 lesion in the TNM system. 2. **Analysis of Incorrect Options:** * **Option A:** Growth extending into but not through the muscularis propria is classified as **Stage B1**. * **Option B:** Any regional lymph node involvement automatically moves the classification to **Stage C**. Specifically, C1 involves nodes but the primary tumor is limited to the wall, while C2 involves nodes with the primary tumor extending through the wall. * **Option C:** This represents **Stage D**, indicating systemic spread (e.g., liver or lung metastasis). **High-Yield Clinical Pearls for NEET-PG:** * **Dukes’ A:** Limited to mucosa/submucosa (T1). * **Dukes’ B1:** Extends into muscularis propria but not through it (T2, N0). * **Dukes’ B2:** Extends through muscularis propria (T3, N0). * **Dukes’ C:** Lymph node positive (Any T, N1/N2). * **Dukes’ D:** Distant metastasis (M1). * **Prognostic Note:** The most important prognostic factor in colorectal cancer is the **status of regional lymph nodes**. * **Modern Practice:** While Dukes' is historically significant, the **TNM staging system** is now the gold standard for clinical management.

Q: Which of the following is false regarding cecal volvulus?

Cecopexy is the procedure of choice.. **Explanation:** **1. Why Option D is the correct (False) statement:** While **cecopexy** (fixing the cecum to the lateral abdominal wall) was historically practiced, it is **not the procedure of choice** due to high recurrence rates (up to 40%). The current gold standard for a viable cecum is **ileocolic resection** with primary anastomosis. If the patient is unstable or the bowel is gangrenous, resection with an ileostomy is preferred. **2. Analysis of other options:** * **Option A (True):** Since the cecum is the proximal part of the large bowel, its torsion often leads to a functional or mechanical blockage of the terminal ileum, presenting as **small bowel obstruction** (vomiting, central distension). * **Option B (True):** On X-ray, cecal volvulus typically shows a "coffee bean" appearance. Unlike sigmoid volvulus (which points to the RUQ), cecal volvulus usually displaces the dilated cecum to the **left upper quadrant (LUQ)** or epigastrium, with the convexity directed toward the **left**. * **Option C (True):** Endoscopic detorsion is successful in 80% for sigmoid volvulus. This is due to the technical difficulty of reaching the right colon and the high risk of perforation. **Clinical Pearls for NEET-PG:** * **Predisposing factor:** Incomplete fixation of the ascending colon to the retroperitoneum (**"mobile cecum"**). * **Radiological Signs:** "Coffee bean" sign, "Bird’s beak" sign on gastrografin enema. * **Axial Torsion vs. Cecal Bascule:** Axial torsion (true volvulus) is more common; Cecal bascule involves the cecum folding anteriorly over the ascending colon. * **Management Rule:** If viable → Resection/Anastomosis; If gangrenous → Resection/Stoma.

Q: Which condition presents with a 'bird's beak' appearance?

Volvulus. **Explanation:** The **'bird’s beak' appearance** is a classic radiological sign seen in **Sigmoid Volvulus**. This occurs when the sigmoid colon twists on its mesenteric axis, causing a high-grade mechanical obstruction. On a contrast enema (Barium enema), the contrast tapers at the site of the twist, resembling a bird's beak or an ace of spades. On a plain X-ray, this condition typically presents as a 'coffee bean' sign. **Analysis of Options:** * **Volvulus (Correct):** Specifically, sigmoid volvulus. The torsion creates a funnel-shaped narrowing at the point of the twist. * **Testicular torsion:** This is a urological emergency. While it involves twisting, the diagnosis is clinical or via Doppler ultrasound (showing absent blood flow), not a 'bird's beak' sign. * **Meconium ileus:** Associated with Cystic Fibrosis, it shows a 'soap bubble' appearance (Neuhauser sign) on X-ray due to air mixing with thick meconium in the terminal ileum. * **Ileal atresia:** Presents with multiple air-fluid levels and a 'triple bubble' sign (if high ileal) or microcolon on contrast enema. **NEET-PG High-Yield Pearls:** * **Sigmoid Volvulus:** Most common site of volvulus; associated with a high-fiber diet and chronic constipation. * **Management:** Sigmoidoscopic detorsion is the initial treatment of choice if there is no gangrene. * **Differential:** Achalasia Cardia also shows a 'bird's beak' appearance on a barium swallow due to the failure of the Lower Esophageal Sphincter (LES) to relax. * **Cecal Volvulus:** Shows a 'fetal lamb' or 'comma' sign on X-ray.

Q: Which of the following statements regarding 'Fistula in ano' is true?

The intersphincteric type is the most common.. **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).

Q: What is the name of the instrument shown?

Proctoscope. ***Proctoscope*** - A **short, rigid instrument** (typically 6-8 cm long) specifically designed for **direct visualization** of the **anal canal** and **lower rectum**. - Features a **straight, tubular design** with built-in lighting and is commonly used for **hemorrhoid evaluation** and **anorectal procedures**. *Sigmoidoscope* - A **longer instrument** (25-60 cm) designed to examine the **sigmoid colon** and **rectum**, extending much further than a proctoscope. - Available in both **rigid** and **flexible** versions, requiring more extensive preparation and patient positioning. *Colonoscope* - A **long, flexible endoscope** (typically 160-180 cm) used for **complete colonic examination** from rectum to cecum. - Features **advanced optics**, **biopsy channels**, and **therapeutic capabilities** for comprehensive colonoscopy procedures. *Rhinoscope* - A **nasal examination instrument** with a **speculum-like design** used to visualize the **nasal cavity** and **nasopharynx**. - Completely different anatomy target with **angled mirrors** or **fiber-optic lighting** for **ENT procedures**.

Q: What is meant by Ca colon stage III c?

Extension upto serosa & lymph nodes.. 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.

Q: A villous polyp of the rectum most commonly manifests as which of the following?

Mucus diarrhea with hypokalemia. **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.

Question 1

A complicated case of diverticular disease is defined as diverticula with which of the following complications?

Accepted Answer

Abscess and perforation

Answer

Abdominal pain

Answer

Constipation or diarrhea

Answer

Diverticular bleeding

Question 2

In Duke's classification of cancer rectum, what does stage B2 denote?

Accepted Answer

Tumor invades perirectal fat

Answer

Growth extends through the muscularis propria but not into perirectal fat

Answer

Regional nodes involved

Answer

Distant metastasis

Question 3

Which of the following is false regarding cecal volvulus?

Accepted Answer

Cecopexy is the procedure of choice.

Answer

May present with small bowel obstruction.

Answer

May present with air fluid levels in the right upper quadrant and convexity towards the left.

Answer

Endoscopic derotation is generally less effective than for sigmoid volvulus.

Question 4

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?

Accepted Answer

Delorme procedure

Answer

Well's resection

Answer

Abdominal Rectopexy

Answer

Resection Rectopexy

Question 5

Which condition presents with a 'bird's beak' appearance?

Accepted Answer

Volvulus

Answer

Testicular torsion

Answer

Meconium ileus

Answer

Ileal atresia

Question 6

All of the following are true about rectal cancer EXCEPT:

Accepted Answer

Dissection lateral to the endopelvic fascia investing the mesorectum causes local recurrence.

Answer

The most common symptom is hematochezia.

Answer

Precise location of the tumor is determined with rigid proctosigmoidoscopy.

Answer

The radiation dose is 60 Gray.

Question 7

Which of the following statements regarding 'Fistula in ano' is true?

Accepted Answer

The intersphincteric type is the most common.

Answer

Posterior fistulae typically have straight tracks.

Answer

High fistulae can be operated on without significant risk of incontinence.

Answer

High and low divisions of fistulae are made in relation to the pelvic floor.

Question 8

What is the name of the instrument shown?

Accepted Answer

Proctoscope

Answer

Sigmoidoscope

Answer

Colonoscope

Answer

Rhinoscope

Question 9

What is meant by Ca colon stage III c?

Accepted Answer

Extension upto serosa & lymph nodes.

Answer

Hepatic metastasis.

Answer

Extension upto serosa.

Answer

Extension upto mucosa.

Question 10

A villous polyp of the rectum most commonly manifests as which of the following?

Accepted Answer

Mucus diarrhea with hypokalemia

Answer

Bleeding per rectum

Answer

Prolapse of the rectum

Answer

Bowel obstruction

Colorectal Surgery — MCQs

Colorectal Surgery — MCQs

On this page

Practice by Chapter

Want unlimited practice?