Colorectal Surgery Practice Questions

Q: Ten years after diagnosis of total proctocolitis, this patient undergoes colonoscopy and biopsy reveals high-grade dysplasia in 2-10 specimens. What should the physician recommend?

Total proctocolectomy. **Explanation:** This question addresses the management of precancerous lesions in patients with long-standing **Ulcerative Colitis (UC)**. Patients with total proctocolitis (pancolitis) for over 8–10 years are at a significantly increased risk for **Colorectal Cancer (CRC)**. **1. Why Option D is Correct:** In the setting of chronic UC, **High-Grade Dysplasia (HGD)** is a strong predictor of either synchronous or future malignancy. Studies show that approximately 40–50% of UC patients with HGD already have an undetected invasive adenocarcinoma elsewhere in the colon. Because the dysplasia in UC is often multifocal and difficult to visualize endoscopically (unlike sporadic polyps), the standard of care is **Total Proctocolectomy (TPC)**. This procedure is curative for both the underlying UC and the risk of malignancy. **2. Why Other Options are Incorrect:** * **Option A & C:** Surveillance (waiting 1 year) or simply repeating the biopsy is dangerous. Once HGD is confirmed by a gastrointestinal pathologist, the risk of occult cancer is too high to justify delay. * **Option B:** Steroids treat active inflammation (flare-ups) but have no role in treating or reversing cellular dysplasia or preventing cancer. **Clinical Pearls for NEET-PG:** * **Indications for Surgery in UC:** HGD, Low-Grade Dysplasia (LGD) if multifocal or associated with a lesion (DALM), persistent symptoms despite maximal medical therapy, or complications (perforation, toxic megacolon). * **Screening Protocol:** Surveillance colonoscopy should begin **8–10 years** after the diagnosis of pancolitis. * **DALM (Dysplasia Associated Lesion or Mass):** If a dysplastic lesion cannot be completely resected endoscopically, TPC is mandatory. * **Gold Standard Surgery:** Restorative Proctocolectomy with **Ileal Pouch-Anal Anastomosis (IPAA)** is the procedure of choice for most patients.

Q: What is a known complication of a stoma (e.g., colostomy)?

All of the above. **Explanation:** A stoma is an artificial opening created between a hollow viscus (like the colon or ileus) and the anterior abdominal wall. Because this involves altering the abdominal anatomy and exteriorizing a segment of bowel, it is prone to several mechanical and physiological complications. **Why "All of the Above" is correct:** The correct answer is **D** because prolapse, stenosis, and retraction are all classic, well-documented complications of stoma formation: * **Prolapse (A):** This occurs when a segment of the bowel protrudes excessively through the stoma opening. It is often due to an oversized opening in the abdominal wall or inadequate fixation of the mesentery. * **Stenosis (B):** This is the narrowing of the stoma outlet, often caused by ischemia of the stoma edge, chronic inflammation, or excessive scarring during the healing process. It can lead to obstructive symptoms. * **Retraction (C):** This happens when the stoma sinks below the level of the skin. It is frequently caused by excessive tension on the bowel limb (often in obese patients) or inadequate mobilization of the mesentery. **High-Yield Clinical Pearls for NEET-PG:** * **Parastomal Hernia:** The most common late complication of a stoma. * **Skin Excoriation:** The most common overall complication, especially in ileostomies due to the alkaline nature of small bowel output. * **Ischemia/Necrosis:** The most serious early complication (usually occurs within 24 hours), requiring immediate surgical re-evaluation if the stoma appears dusky or black. * **High-Output Stoma:** Defined as output >1.5–2L/day; it can lead to severe electrolyte imbalances (hypokalemia) and dehydration.

Q: All of the following are associated with carcinoma of the colon except?

Fibre diet. ### Explanation The correct answer is **C. Fibre diet**. In colorectal surgery and oncology, the relationship between diet and Colorectal Cancer (CRC) is a high-yield topic. A **high-fibre diet** is considered a **protective factor**, not a risk factor, for carcinoma of the colon. #### Why Fibre Diet is the Correct Answer: Dietary fibre reduces the risk of colon cancer through several mechanisms: 1. **Dilution:** It increases stool bulk, thereby diluting potential carcinogens and bile acids in the lumen. 2. **Transit Time:** It speeds up colonic transit, reducing the duration of contact between the mucosa and carcinogens. 3. **Fermentation:** Gut bacteria ferment fibre into **Short-Chain Fatty Acids (SCFAs)** like butyrate, which have anti-inflammatory and anti-neoplastic effects on colonocytes. #### Analysis of Incorrect Options (Risk Factors): * **A. Smoking:** Long-term tobacco use is associated with an increased risk of colorectal adenomas and a higher incidence of CRC, particularly microsatellite unstable (MSI-high) tumors. * **B. Alcohol:** Heavy alcohol consumption is a well-established risk factor. It interferes with folate absorption and its metabolite, acetaldehyde, is a known carcinogen. * **D. Fatty food:** High intake of saturated fats (red meat) increases the secretion of primary bile acids. These are converted by gut bacteria into secondary bile acids (deoxycholic acid), which are promoters of carcinogenesis. #### NEET-PG High-Yield Pearls: * **Most common site of CRC:** Sigmoid colon (historically), though the incidence of right-sided (proximal) colon cancer is increasing. * **Protective agents:** Aspirin/NSAIDs (via COX-2 inhibition), Calcium, Vitamin D, and High-fibre diet. * **Strongest Risk Factor:** Family history/Genetics (FAP, Lynch Syndrome) and Long-standing Ulcerative Colitis. * **Dietary culprit:** Polycyclic aromatic hydrocarbons formed when meat is "charred" or grilled at high temperatures.

Q: What is the treatment of choice for chronic ulcerative colitis?

Proctocolectomy with ileoanal pouch anastomosis. **Explanation:** Ulcerative Colitis (UC) is a mucosal disease that involves the rectum and extends proximally to involve the colon. Because the disease is confined to the mucosa of the large intestine, a **Total Proctocolectomy** is considered curative. **1. Why Option C is Correct:** The gold standard treatment for chronic UC is **Total Proctocolectomy with Ileoanal Pouch Anastomosis (IPAA)**, often referred to as a "J-pouch." This procedure is preferred because it removes the entire diseased organ (colon and rectum) while preserving fecal continence and avoiding a permanent stoma. It eliminates the risk of future colorectal malignancy, which is a significant concern in chronic UC. **2. Why Other Options are Incorrect:** * **Option A:** Colectomy with ileostomy leaves the rectum behind (Proctitis remains), meaning the disease is not cured and the risk of rectal cancer persists. * **Option B:** Manual proctectomy is technically part of the procedure, but "Proctocolectomy" is the standard surgical terminology for the complete removal of both the colon and rectum. * **Option D:** Ileorectal anastomosis (IRA) carries a high risk of recurrence in the retained rectum and is generally avoided unless the rectum is relatively spared and the patient cannot tolerate a pouch. **Clinical Pearls for NEET-PG:** * **Indications for Surgery:** Intractability to medical therapy (most common), toxic megacolon, perforation, and dysplasia/carcinoma. * **Curative Nature:** Surgery is curative for UC but **not** for Crohn’s disease (due to its transmural and skip-lesion nature). * **Pouchitis:** The most common long-term complication after IPAA, typically treated with Metronidazole or Ciprofloxacin. * **Backwash Ileitis:** Seen in 10-20% of patients with pancolitis; it does not contraindicate IPAA.

Q: What is the best investigation for colorectal carcinoma?

Colonoscopy and biopsy. **Explanation:** **Colonoscopy with biopsy** is the gold standard and the investigation of choice for colorectal carcinoma (CRC). Its superiority lies in its ability to provide **direct visualization** of the entire colon (from rectum to cecum) and allow for **tissue diagnosis** via biopsy, which is mandatory for confirming malignancy and planning treatment. It can also detect and remove synchronous polyps, reducing the risk of future cancers. **Why other options are incorrect:** * **Exfoliative cytology:** This involves examining shed cells in the stool. It has very low sensitivity and specificity for diagnosing CRC and is not used in standard clinical practice. * **Air contrast barium enema:** While it can show the "apple-core" deformity (classic for annular growths), it has a high false-negative rate for small lesions and cannot provide a tissue diagnosis. It is now largely replaced by CT Colonography or Colonoscopy. * **Ultrasound:** Transabdominal USG is poor at visualizing hollow viscus organs like the colon. While **Endorectal Ultrasound (ERUS)** is excellent for *staging* the depth of rectal wall invasion (T-staging), it is not the primary diagnostic tool for the cancer itself. **Clinical Pearls for NEET-PG:** * **Screening:** For average-risk individuals, screening starts at **age 45** (updated guidelines). * **Most common site:** Historically the rectum, but there is a shifting trend toward the **proximal (right) colon**. * **Tumor Marker:** **CEA** (Carcinoembryonic Antigen) is used for monitoring recurrence and prognosis, **not** for primary diagnosis or screening. * **Investigation of choice for staging:** Contrast-Enhanced CT (CECT) of the Chest, Abdomen, and Pelvis. For rectal cancer specifically, **MRI Pelvis** is the gold standard for local staging.

Question 1

A 65-year-old man presents with intermittent constipation and microcytic anemia. Barium enema shows a non-obstructing "apple-core" lesion in the proximal sigmoid colon. Colonoscopy confirms the mass and finds no synchronous lesions. What is the most appropriate next step in management?

Accepted Answer

Left hemicolectomy

Answer

Right hemicolectomy

Answer

Subtotal colectomy

Answer

Total colectomy

Question 2

Full bowel preparation is avoided in all, except:

Accepted Answer

Carcinoma colon

Answer

Hirschsprung's disease

Answer

Ulcerative colitis

Answer

Irritable bowel syndrome

Question 3

What is the management for carcinoma of the sigmoid colon with obstruction?

Accepted Answer

Hamann's procedure

Answer

Resection and end-to-end anastomosis with proximal colostomy

Answer

Proximal colostomy with distal ligation

Answer

Sub-total colectomy

Question 4

External hemorrhoids, located below the dentate line, are characterized by which of the following?

Accepted Answer

Being painful

Answer

Management involving ligation

Answer

Absence of skin tags

Answer

Potential for malignant transformation

Question 5

Ten years after diagnosis of total proctocolitis, this patient undergoes colonoscopy and biopsy reveals high-grade dysplasia in 2-10 specimens. What should the physician recommend?

Accepted Answer

Total proctocolectomy

Answer

Repeat colonoscopy in 1 year

Answer

Increase steroid dosage

Answer

Early repeat colonoscopy and biopsy of the area

Question 6

What is a known complication of a stoma (e.g., colostomy)?

Accepted Answer

All of the above

Answer

Prolapse

Answer

Stenosis

Answer

Retraction

Question 7

All of the following are associated with carcinoma of the colon except?

Accepted Answer

Fibre diet

Answer

Smoking

Answer

Alcohol

Answer

Fatty food

Question 8

What is the treatment of choice for chronic ulcerative colitis?

Accepted Answer

Proctocolectomy with ileoanal pouch anastomosis

Answer

Colectomy with ileostomy

Answer

Colectomy with manual proctectomy and ileoanal pouch anastomosis

Answer

Ileorectal anastomosis

Question 9

Which of the following best assesses the prognosis for carcinoma of the rectum?

Accepted Answer

Histological grading

Answer

Site of the tumor

Answer

Size of the tumor

Answer

Duration of the symptoms

Question 10

What is the best investigation for colorectal carcinoma?

Accepted Answer

Colonoscopy and biopsy

Answer

Exfoliative cytology

Answer

Air contrast barium enema

Answer

Ultrasound

Colorectal Surgery — MCQs

Colorectal Surgery — MCQs

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