Colorectal Surgery Practice Questions

Q: According to Hagitt's classification, a polyp invading the neck between the head and stalk is classified as which level?

Level 2. **Explanation:** Haggitt’s classification is a clinical staging system used to determine the depth of invasion of adenocarcinoma arising in a pedunculated polyp. It is crucial for deciding whether a simple polypectomy is sufficient or if a formal bowel resection is required. * **Level 0:** Carcinoma in situ or intramucosal carcinoma (no invasion of muscularis mucosae). * **Level 1:** Carcinoma invades through the muscularis mucosae into the submucosa but is limited to the **head** of the polyp. * **Level 2 (Correct Answer):** Carcinoma invades the **neck** of the polyp (the junction between the head and the stalk). * **Level 3:** Carcinoma invades any part of the **stalk**. * **Level 4:** Carcinoma invades the **base** of the polyp or the submucosa of the adjacent bowel wall. **Why other options are incorrect:** * **Level 1:** Limited to the head only. * **Level 3:** Involves the stalk itself, beyond the neck. * **Level 4:** Represents the highest risk; all sessile (non-pedunculated) polyps with invasive carcinoma are automatically classified as Level 4. **High-Yield Clinical Pearls for NEET-PG:** 1. **Management:** Levels 1, 2, and 3 are generally considered "low risk" and can be managed by endoscopic polypectomy alone if the margins are clear (>2mm) and the tumor is well-differentiated. 2. **Level 4** always requires formal surgical resection because the risk of lymph node metastasis is significantly higher (approx. 10-25%). 3. **Sessile Polyps:** Remember that Haggitt’s Levels 1-3 apply only to pedunculated polyps. Any invasion in a sessile polyp is Level 4.

Q: Peritoneal metastasis in colon cancer is staged as:

M1c. This question is based on the **AJCC 8th Edition TNM Staging** for colorectal cancer. Understanding the sub-classification of distant metastasis (M stage) is crucial for NEET-PG, as it dictates prognosis and management. ### **Explanation of the Correct Answer** **C. M1c:** According to the AJCC 8th edition, **M1c** is specifically defined as metastasis to the **peritoneal surface**, with or without involvement of other visceral organs (like the liver or lungs). Peritoneal carcinomatosis carries a significantly poorer prognosis compared to isolated solid organ metastasis, which is why it was given its own distinct sub-category in the latest update. ### **Analysis of Incorrect Options** * **A. M1a:** This refers to metastasis confined to **one organ or site** (e.g., liver only, lung only, or a single distant lymph node) without peritoneal involvement. * **B. M1b:** This refers to metastasis to **two or more organs/sites** (e.g., both liver and lungs) but specifically **excluding** the peritoneum. * **D. M1d:** This category does not exist in the current AJCC 8th edition TNM staging for colorectal cancer. ### **High-Yield Clinical Pearls for NEET-PG** * **Most common site of metastasis:** The **Liver** (via the portal venous system). * **Most common site for Rectal Cancer metastasis:** The **Lungs** (due to systemic venous drainage of the middle/inferior rectal veins bypassing the liver). * **Prognostic Significance:** M1c (peritoneal spread) has the worst survival rate among all M1 categories. * **Management:** While M1a/b may be candidates for surgical resection, M1c often requires specialized approaches like **CRS (Cytoreductive Surgery)** combined with **HIPEC (Hyperthermic Intraperitoneal Chemotherapy)** in selected patients.

Q: What is the most common cause of painless bleeding per rectum in a man?

Piles (Hemorrhoids). **Explanation:** The correct answer is **Piles (Hemorrhoids)**. In clinical practice and for the NEET-PG exam, internal hemorrhoids are recognized as the most common cause of painless, bright red bleeding per rectum (hematochezia) across all age groups and genders. **Why Piles is correct:** Internal hemorrhoids originate above the dentate line, where the mucosa is supplied by visceral nerves (insensitive to pain). The classic presentation is "splashing the pan"—painless, bright red bleeding occurring at the end of defecation. While external hemorrhoids can be painful if thrombosed, the primary symptom of internal piles is bleeding without pain. **Analysis of Incorrect Options:** * **Fissure-in-ano:** This is the most common cause of **painful** bleeding per rectum. The pain is typically sharp, "knife-like," and persists for hours after defecation. * **Diverticulosis:** While this is the most common cause of **massive, brisk** lower GI bleeding in the elderly, it is less frequent in the general population compared to hemorrhoids. * **Colorectal Cancer:** Though a critical differential for painless bleeding, it is statistically less common than hemorrhoids, especially in younger demographics. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of painless bleeding (Overall):** Hemorrhoids. * **Most common cause of painful bleeding:** Anal Fissure. * **Most common cause of massive lower GI bleed:** Diverticulosis. * **Most common cause of rectal bleeding in children:** Meckel’s Diverticulum or Juvenile Polyps. * **Rule of Thumb:** Any patient over 40 presenting with new-onset rectal bleeding must undergo a digital rectal examination (DRE) and proctoscopy/colonoscopy to rule out malignancy.

Q: A 50-year-old man presents with left colon carcinoma. Which of the following findings is characteristic?

Apple core deformity on imaging. **Explanation:** The clinical presentation of colorectal carcinoma varies significantly based on the anatomical location of the tumor due to differences in luminal diameter and stool consistency. **1. Why Option A is Correct:** Left-sided colon cancers (especially in the sigmoid colon) tend to be **annular and infiltrating**. As the tumor grows circumferentially, it causes luminal narrowing and significant constriction. On a barium enema, this appears as a short, sharply defined segment of narrowing with overhanging edges, classically described as the **"Apple Core Deformity"** or "Napkin Ring" sign. **2. Why the Other Options are Incorrect:** * **Option B:** While bleeding can occur, the "usual" or hallmark presentation of left-sided lesions is **altered bowel habits** and **obstructive symptoms** (constipation/tenesmus). Gross bleeding (hematochezia) is more common in rectal or distal sigmoid cancers, whereas occult bleeding is characteristic of right-sided lesions. * **Option C:** A **palpable mass** is more common in **right-sided (caecal) tumors** because the right colon has a larger caliber, allowing the tumor to grow into a large, exophytic mass before causing symptoms. * **Option D:** Stools in the left colon are **solid/formed**. Because the lumen is narrow and the stool is firm, obstruction is common. Liquid stools are found in the right colon, where the lumen is wide and the contents have not yet been dehydrated. **Clinical Pearls for NEET-PG:** * **Right-sided Cancer:** Presents with iron deficiency anemia (occult blood loss) and a palpable mass in the right iliac fossa. * **Left-sided Cancer:** Presents with intestinal obstruction and "pencil-thin" stools. * **Gold Standard Investigation:** Contrast-enhanced CT (CECT) for staging; Colonoscopy with biopsy for diagnosis. * **Tumor Marker:** CEA (primarily used for monitoring recurrence, not for screening).

Q: A 40-year-old male, a soldier, presented to the OPD with serous discharge and discomfort from the gluteal region. He reported a history of an abscess in the same area two years prior. Which of the following is a treatment option for this condition?

All of the above. **Explanation:** The clinical presentation of a middle-aged male (soldier) with chronic serous discharge and a history of an abscess in the gluteal region (natal cleft) is classic for **Pilonidal Sinus Disease (PNS)**. This condition is an acquired chronic inflammatory process caused by hair penetration into the subcutaneous tissue, common in individuals with sedentary occupations or those subjected to repetitive local trauma (e.g., "Jeep bottom"). **Why "All of the above" is correct:** The management of pilonidal sinus aims to excise the diseased tissue and prevent recurrence by flattening the deep natal cleft. * **Limberg’s Flap:** A type of **Rhomboid flap** where a diamond-shaped excision is performed, and a transposition flap is used to cover the defect. It is highly effective in reducing recurrence. * **Karydakis Flap:** An asymmetrical lateralization procedure where the wound is closed off-center from the midline to avoid tension and moisture accumulation in the cleft. * **Bascom’s Procedure:** A "minimal surgery" technique involving "pit picking" (excision of the midline pits) and a lateral incision for drainage. **Clinical Pearls for NEET-PG:** * **Risk Factors:** Obesity, hirsutism, deep natal cleft, and prolonged sitting (Soldiers/Drivers). * **Pathogenesis:** It is an **acquired** condition, not congenital. * **Primary Treatment:** Simple excision and primary closure have high recurrence rates. Flap reconstructions (Limberg, Karydakis) are preferred for recurrent or complex cases. * **Z-plasty:** Another flap technique used to flatten the natal cleft.

Q: Internal fistulas associated with colonic diverticulitis are most commonly what type?

Colovesical. **Explanation:** In the context of chronic or recurrent diverticulitis, transmural inflammation can lead to the formation of an abscess that subsequently ruptures into an adjacent organ, creating an **internal fistula**. **1. Why Colovesical is Correct:** The **colovesical fistula** (communication between the colon and the bladder) is the most common type of internal fistula associated with diverticulitis, accounting for approximately **65% of cases**. This occurs due to the anatomical proximity of the sigmoid colon (the most common site for diverticulitis) to the urinary bladder. It is significantly more common in males because the uterus acts as a protective barrier between the colon and bladder in females. **2. Analysis of Incorrect Options:** * **Coloenteric (B):** Communication with the small bowel. While common, it occurs less frequently than colovesical. * **Colocolonic (C):** Communication between two segments of the colon; these are often asymptomatic and less common. * **Colovaginal (D):** Communication with the vagina. This is the second most common type in females, particularly those who have undergone a hysterectomy. **3. High-Yield Clinical Pearls for NEET-PG:** * **Classic Presentation:** Patients typically present with **pneumaturia** (gas in urine) and **fecaluria** (feces in urine), alongside recurrent UTIs. * **Diagnostic Gold Standard:** While CT scan is the initial investigation of choice to show air in the bladder, **cystoscopy** is often performed to rule out malignancy, though it may only show localized edema (bullous cystitis). * **Bourne Test:** A high-yield historical test where charcoal is given orally and later detected in the urine to confirm the fistula. * **Management:** Surgical resection of the diseased colonic segment (usually sigmoidectomy) with primary anastomosis and closure of the bladder defect.

Q: What is the standard treatment for stage II carcinoma of the anal canal?

Concurrent chemoradiation. **Explanation:** The standard of care for most squamous cell carcinomas (SCC) of the anal canal (Stage I to III) is **Concurrent Chemoradiation**, also known as the **Nigro Protocol**. 1. **Why Option C is Correct:** Unlike rectal cancer, where surgery is often the primary modality, anal canal cancer is highly radiosensitive and chemosensitive. The Nigro Protocol (typically using 5-Fluorouracil and Mitomycin-C combined with external beam radiation) achieves high rates of local control and, crucially, allows for **sphincter preservation**. This avoids the need for a permanent colostomy while maintaining survival rates comparable to radical surgery. 2. **Why Other Options are Incorrect:** * **Option A & B:** Abdominoperineal Resection (APR) involves the permanent removal of the rectum and anus. It was historically the first-line treatment but is now reserved only for **salvage therapy** (recurrent or persistent disease after chemoradiation) or for patients who cannot tolerate radiation. * **Option D:** Neoadjuvant chemotherapy followed by surgery is not a standard protocol for anal SCC; concurrent administration is required to exploit the radiosensitizing effects of the chemotherapy. **High-Yield Clinical Pearls for NEET-PG:** * **Most common histology:** Squamous Cell Carcinoma (associated with **HPV 16 and 18**). * **Lymphatic Drainage:** Above the dentate line to internal iliac nodes; below the dentate line to **superficial inguinal nodes**. * **Nigro Protocol Components:** 5-FU + Mitomycin + Radiation (Note: Cisplatin may be used in metastatic cases). * **Treatment Exception:** Very small (Stage IA, <2cm), well-differentiated tumors of the **anal margin** (not canal) may be treated with wide local excision alone.

Question 1

Rectal examination should not be done in which of the following conditions?

Accepted Answer

Anal fissure

Answer

Fistula in ano

Answer

Prolapsed piles with bleeding

Answer

Anal stenosis

Question 2

According to Hagitt's classification, a polyp invading the neck between the head and stalk is classified as which level?

Accepted Answer

Level 2

Answer

Level 1

Answer

Level 3

Answer

Level 4

Question 3

Peritoneal metastasis in colon cancer is staged as:

Accepted Answer

M1c

Answer

M1a

Answer

M1b

Answer

M1d

Question 4

What is the most common cause of painless bleeding per rectum in a man?

Accepted Answer

Piles (Hemorrhoids)

Answer

Fissure-in-ano

Answer

Diverticulosis

Answer

None of the above

Question 5

A 50-year-old man presents with left colon carcinoma. Which of the following findings is characteristic?

Accepted Answer

Apple core deformity on imaging

Answer

Bleeding is the usual presentation

Answer

A palpable mass is usually present

Answer

The stools are typically liquid

Question 6

What is true about colonic volvulus?

Accepted Answer

Common in psychiatric patients

Answer

Most common in the cecum

Answer

Associated with a bird's beak sign on imaging

Answer

Can present as intestinal obstruction

Question 7

Which of the following structures is removed in an extended right colectomy?

Accepted Answer

Ascending colon, cecum, terminal ileum, a portion of the transverse colon, the spleen, and the gallbladder

Answer

Ascending colon, cecum, terminal ileum, and a portion of the transverse colon

Answer

Ascending colon, cecum, terminal ileum, a portion of the transverse colon, and the spleen

Answer

Ascending colon, cecum, terminal ileum, a portion of the transverse colon, the spleen, the gallbladder, and the pancreas

Question 8

A 40-year-old male, a soldier, presented to the OPD with serous discharge and discomfort from the gluteal region. He reported a history of an abscess in the same area two years prior. Which of the following is a treatment option for this condition?

Accepted Answer

All of the above

Answer

Limberg's flap

Answer

Karydakis flap and rhomboid flap

Answer

Bascom's procedure

Question 9

Internal fistulas associated with colonic diverticulitis are most commonly what type?

Accepted Answer

Colovesical

Answer

Coloenteric

Answer

Colocolonic

Answer

Colovaginal

Question 10

What is the standard treatment for stage II carcinoma of the anal canal?

Accepted Answer

Concurrent chemoradiation

Answer

Abdominoperineal resection (APR)

Answer

APR followed by chemoradiation

Answer

Neoadjuvant chemotherapy followed by surgery

Colorectal Surgery — MCQs

Colorectal Surgery — MCQs

On this page

Practice by Chapter

Want unlimited practice?