Colorectal Surgery Practice Questions

Q: Which of the following is commonly associated with Crohn's disease?

Cologastric fistula. **Explanation:** Crohn’s disease is a chronic inflammatory bowel disease characterized by **transmural inflammation**, which leads to the formation of deep fissures and tracks. These tracks often penetrate the serosa, resulting in **fistula formation** between the bowel and adjacent organs. **Why Cologastric fistula is correct:** While fistulae in Crohn’s disease most commonly involve the ileum (e.g., ileo-ileal or ileocolic), **cologastric fistulae** are a classic, albeit rare, complication specifically associated with Crohn’s disease or malignancy. In the context of inflammatory conditions, Crohn’s is the most common cause of a fistula connecting the colon (usually the transverse colon) to the stomach. Patients often present with "feculent vomiting" or malabsorption. **Analysis of Incorrect Options:** * **Coloureteric fistula:** These are extremely rare and more commonly associated with diverticulitis or pelvic malignancies rather than Crohn's disease. * **Colovesical fistula:** This is the most common type of enterovesical fistula overall, but it is most frequently caused by **Diverticulitis** (approx. 65-70% of cases), followed by malignancy. While it can occur in Crohn's, it is not the "defining" association compared to cologastric tracks in surgical exams. * **Coloduodenal fistula:** These are rare and usually secondary to a perforated duodenal ulcer or a malignancy in the right colon/duodenum. **NEET-PG High-Yield Pearls:** * **Most common fistula in Crohn’s:** Entero-enteric (between loops of bowel). * **Most common external fistula:** Enterocutaneous fistula (often post-surgical). * **Perianal disease:** Fistula-in-ano is a hallmark of Crohn’s (seen in up to 30% of patients) and is rarely seen in Ulcerative Colitis. * **Management:** Medical management (Infliximab) is often the first line for fistulizing Crohn's, but surgical resection of the diseased segment is required for refractory cases.

Q: Gardner's syndrome is associated with all except?

Brain tumor. **Explanation:** Gardner’s Syndrome is a clinical variant of **Familial Adenomatous Polyposis (FAP)**, an autosomal dominant condition caused by a mutation in the **APC gene** on chromosome 5q21. It is characterized by the triad of intestinal polyposis, soft tissue tumors, and skeletal abnormalities. **Why "Brain Tumor" is the correct answer:** While brain tumors (specifically medulloblastomas) are associated with FAP, this specific association is known as **Turcot Syndrome**, not Gardner’s Syndrome. Gardner’s is primarily defined by its extracolonic manifestations involving the skin and bone. **Analysis of Incorrect Options:** * **Sebaceous Cyst (and Epidermoid Cysts):** These are classic cutaneous manifestations of Gardner’s Syndrome. They often appear in unusual locations like the face, scalp, and extremities. * **Desmoid Tumor:** These are aggressive fibroblastic tumors that occur in approximately 10-15% of Gardner’s patients, often in the abdominal wall or mesentery, and are a significant cause of morbidity. * **Bony Exostosis (Osteomas):** These are benign bony outgrowths, most commonly found in the mandible and skull. They are a hallmark diagnostic feature of Gardner’s. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic for Gardner’s:** **S**ebaceous cysts, **O**steomas, **D**esmoid tumors, **A**PC gene (**SODA**). * **CHRPE:** Congenital Hypertrophy of Retinal Pigment Epithelium is a highly specific early screening sign for FAP/Gardner’s. * **Dental abnormalities:** Impacted teeth or supernumerary teeth are also common. * **Turcot Syndrome:** Think "Turban" = Brain tumors + FAP.

Q: What is the most common site of colon cancer?

Rectosigmoid region. **Explanation:** The distribution of colorectal cancer is non-uniform across the large bowel. Historically and statistically, the **rectosigmoid region** (comprising the rectum and the sigmoid colon) remains the most common site for primary adenocarcinoma of the colon. * **Why Rectosigmoid is Correct:** Approximately **50–55%** of all colorectal cancers occur in the distal large bowel. Specifically, the rectum accounts for about 30–35% and the sigmoid colon for about 20–25%. This is attributed to the prolonged contact time of concentrated fecal carcinogens with the mucosa in these storage areas. * **Why others are incorrect:** * **Ascending Colon (Right-sided):** While the incidence of right-sided (proximal) colon cancer is increasing (a phenomenon known as "proximal shift"), it still accounts for only about 15–25% of cases. * **Descending Colon:** This segment accounts for roughly 5–10% of cases. * **Transverse Colon:** This is one of the least common sites, accounting for approximately 10% of cases. **High-Yield Clinical Pearls for NEET-PG:** 1. **Clinical Presentation:** Right-sided cancers (Ascending) typically present with **iron deficiency anemia** and occult bleeding, whereas left-sided cancers (Rectosigmoid) present with **altered bowel habits** and features of intestinal obstruction. 2. **Most common site of metastasis:** The **Liver** (via portal venous drainage), except for distal rectal cancer which can spread to the lungs via the systemic circulation. 3. **Gold Standard Investigation:** **Colonoscopy with biopsy** is the investigation of choice for diagnosis. 4. **Tumor Marker:** **CEA** (Carcinoembryonic Antigen) is used for monitoring recurrence, not for primary screening.

Q: In which condition is an anterior resection the preferred surgical method?

Rectal cancer. **Explanation:** **Anterior Resection (AR)** is the gold-standard surgical procedure for cancers located in the **rectum**, specifically those in the upper and middle thirds (above the level of the levator ani). The procedure involves the resection of the diseased rectal segment followed by a primary anastomosis between the colon and the remaining rectum, thereby preserving the anal sphincter and avoiding a permanent colostomy. * **Why Rectal Cancer is Correct:** The term "Anterior Resection" specifically refers to the surgical approach used for rectal lesions where the peritoneal reflection is opened anteriorly to mobilize the rectum. For lower rectal cancers, a **Low Anterior Resection (LAR)** is performed, often utilizing a total mesorectal excision (TME) to ensure oncological clearance. * **Why other options are incorrect:** * **Sigmoid Colon Cancer:** The standard treatment is a **Sigmoid Colectomy**. While the sigmoid is adjacent to the rectum, the term AR is reserved for rectal mobilization. * **Colon Cancer:** General colon cancers (ascending, transverse, descending) are treated with **Hemicolectomies** (Right or Left) or Extended Hemicolectomies. * **Anal Canal Cancer:** The primary treatment for squamous cell carcinoma of the anal canal is the **Nigro Protocol** (Chemoradiotherapy). If surgery is required for salvage, an **Abdominoperineal Resection (APR)** is performed, which involves permanent colostomy. **High-Yield Clinical Pearls for NEET-PG:** 1. **Level of Anastomosis:** In LAR, the anastomosis is below the peritoneal reflection; in Ultra-low AR, it is within 6 cm of the anal verge. 2. **TME (Total Mesorectal Excision):** This is the "holy grail" of rectal surgery to reduce local recurrence. 3. **Sphincter Preservation:** AR is preferred over APR whenever a distal margin of at least 1–2 cm can be achieved to maintain fecal continence.

Q: What is the most common cause of lower gastrointestinal bleeding?

Hemorrhoids. **Explanation:** The most common cause of lower gastrointestinal (GI) bleeding overall is **Hemorrhoids**. While often presenting as minor, painless, bright red rectal bleeding (hematochezia) during or after defecation, their high prevalence in the general population makes them the leading cause of lower GI blood loss. **Why the other options are incorrect:** * **Diverticulosis:** This is the most common cause of **massive, painless** lower GI bleeding in the elderly. While it causes more significant volume loss per episode than hemorrhoids, it is less frequent in the general population. * **Crohn’s Disease:** Inflammatory Bowel Disease (IBD) can cause bloody diarrhea and mucus, but it is a much less common cause of bleeding compared to anorectal pathologies. * **Colorectal Cancer:** While a critical diagnosis to rule out in any patient presenting with hematochezia or iron-deficiency anemia, it is statistically less common than benign causes like hemorrhoids or diverticula. **NEET-PG High-Yield Pearls:** 1. **Most common cause of LGIB:** Hemorrhoids. 2. **Most common cause of *massive* LGIB:** Diverticulosis (specifically right-sided diverticula are more prone to bleed). 3. **Most common cause of LGIB in children:** Meckel’s Diverticulum. 4. **Most common cause of occult GI bleeding:** Iron deficiency anemia secondary to Colorectal Cancer (until proven otherwise). 5. **Angiodysplasia:** The second most common cause of massive LGIB in the elderly; often associated with Aortic Stenosis (**Heyde’s Syndrome**).

Q: Which of the following are types of setons used in fistula in ano surgery?

Cutting seton and draining seton. In the surgical management of fistula-in-ano, a **seton** is a foreign material (such as silk, polypropylene, or vessel loops) passed through the fistula tract. The choice of seton depends on whether the goal is to promote drainage or to gradually divide the sphincter muscle. **1. Why Option C is Correct:** * **Cutting Seton:** This is used to treat "high" or complex fistulae. It is tied tightly and tightened periodically in the clinic. It works by slowly cutting through the sphincter muscle while simultaneously inducing fibrosis behind it. This prevents the muscle ends from snapping apart, thereby maintaining continence while the tract heals. * **Draining (Non-cutting) Seton:** This is tied loosely around the tract. Its primary purpose is to keep the tract open to prevent the formation of recurrent abscesses and to allow the tract to epithelialize and mature before a definitive secondary procedure (like a LIFT or advancement flap). **2. Why Other Options are Incorrect:** * **Dissecting/Fibrosing Seton:** These are not standard surgical classifications. While setons do cause fibrosis, "fibrosing seton" is not a formal term used in surgical literature. * **Dissolving Seton:** Setons are intended to stay in place for weeks or months; therefore, they are made of non-absorbable materials. A dissolving material would fail to provide the necessary long-term tension or drainage. **High-Yield Clinical Pearls for NEET-PG:** * **Goodsall’s Law:** Predicts the trajectory of the fistula tract based on the location of the external opening relative to the transverse anal line. * **Park’s Classification:** Categorizes fistulae into Intersphincteric (most common), Transsphincteric, Suprasphincteric, and Extrasphincteric. * **Hippocrates** was the first to describe the use of a seton (using horsehair). * **Kshara Sutra:** A traditional Indian medicated seton used for gradual chemical cauterization and healing of the tract.

Q: What is the most common site of a chronic fissure in ano?

Posterior. **Explanation:** An anal fissure is a linear tear in the distal anal mucosa, extending from the dentate line to the anal verge. **Why Posterior is Correct:** The **posterior midline** is the most common site for chronic anal fissures, occurring here in over **90% of cases**. The primary pathophysiological reason is the **lack of muscular support** and **poor blood supply** (relative ischemia) at the posterior commissure. The elliptical arrangement of the external anal sphincter fibers provides less support posteriorly compared to the lateral sides. Additionally, during defecation, the acute angle of the anorectal junction causes the greatest mechanical strain to be exerted on the posterior anal canal. **Why Other Options are Incorrect:** * **Anterior:** This is the second most common site, seen in about 10% of women and 1% of men. Anterior fissures are often associated with pelvic floor weakness or trauma during childbirth. * **Lateral/Anterolateral:** Fissures in these locations are highly uncommon. If a fissure is found in a lateral position, a clinician must suspect underlying systemic conditions such as **Crohn’s disease**, tuberculosis, HIV/AIDS, or anal malignancy. **High-Yield Clinical Pearls for NEET-PG:** * **Sentinel Pile:** A chronic fissure is characterized by a triad: the fissure itself, hypertrophied anal papillae (proximal), and a **sentinel skin tag** (distal). * **Management:** The gold standard surgical treatment for chronic fissure in ano is **Lateral Internal Sphincterotomy (LIS)**. * **Pathophysiology:** The "vicious cycle" of a fissure involves pain leading to internal sphincter spasm, which causes ischemia, preventing the tear from healing.

Q: What is the treatment of choice for a 70-year-old male patient presenting with peritonitis secondary to ruptured diverticulitis?

Hamann's procedure. **Explanation:** The clinical presentation of peritonitis secondary to ruptured diverticulitis (Hinchey Stage III or IV) in an elderly patient is a surgical emergency. The treatment of choice is **Hartmann’s Procedure** (noted as Hamann’s in the options). **1. Why Hartmann’s Procedure is Correct:** In the setting of fecal or purulent peritonitis, the bowel wall is often edematous, and the peritoneal cavity is heavily contaminated. Performing a primary anastomosis under these conditions carries a high risk of **anastomotic leak**, which can be fatal in a 70-year-old. Hartmann’s procedure involves resection of the diseased sigmoid colon, closure of the rectal stump, and creation of an end-descending colostomy. This "staged" approach prioritizes patient safety by removing the source of sepsis without the risk of a breakdown at the suture line. **2. Why Other Options are Incorrect:** * **Conservative Management:** This is appropriate for uncomplicated diverticulitis (Hinchey I). Peritonitis indicates a perforation, which is a surgical emergency. * **Primary Resection and Anastomosis:** While increasingly used in stable, younger patients with Hinchey II/III disease, it is generally avoided in elderly patients with frank peritonitis due to the high risk of leak and mortality. * **Whipple Procedure:** This is a pancreaticoduodenectomy used for periampullary or pancreatic head cancers, not for colonic pathology. **Clinical Pearls for NEET-PG:** * **Hinchey Classification:** Stage I (Pericolic abscess), Stage II (Pelvic abscess), Stage III (Purulent peritonitis), Stage IV (Fecal peritonitis). * **Gold Standard:** Hartmann’s remains the classic "gold standard" for Hinchey III and IV. * **Laparoscopic Lavage:** A controversial alternative for Hinchey III, but not yet the standard for elderly patients with systemic sepsis.

Question 1

Which of the following is commonly associated with Crohn's disease?

Accepted Answer

Cologastric fistula

Answer

Coloureteric fistula

Answer

Colovesical fistula

Answer

Coloduodenal fistula

Question 2

A 60-year-old male with carcinoma of the descending colon presents with acute intestinal obstruction. What is the treatment of choice in the emergency department?

Accepted Answer

Hartman's procedure

Answer

Defunctioning colostomy

Answer

Total colectomy

Answer

Left hemicolectomy

Question 3

Gardner's syndrome is associated with all except?

Accepted Answer

Brain tumor

Answer

Sebaceous cyst

Answer

Desmoid tumor

Answer

Bony exostosis

Question 4

What is the most common site of colon cancer?

Accepted Answer

Rectosigmoid region

Answer

Ascending colon

Answer

Descending colon

Answer

Transverse colon

Question 5

In which condition is an anterior resection the preferred surgical method?

Accepted Answer

Rectal cancer

Answer

Sigmoid colon cancer

Answer

Colon cancer

Answer

Anal canal cancer

Question 6

What is the most common cause of lower gastrointestinal bleeding?

Accepted Answer

Hemorrhoids

Answer

Diverticulosis

Answer

Crohn's Disease

Answer

Colorectal cancer

Question 7

Which of the following are types of setons used in fistula in ano surgery?

Accepted Answer

Cutting seton and draining seton

Answer

Dissecting seton and draining seton

Answer

Cutting seton and dissolving seton

Answer

Fibrosing seton and dissecting seton

Question 8

What is the most common site of a chronic fissure in ano?

Accepted Answer

Posterior

Answer

Answer

Anterolateral

Answer

Lateral

Question 9

A 40-year-old male with descending colon cancer presents with acute intestinal obstruction. What is the emergency treatment of choice?

Accepted Answer

Hartman's procedure

Answer

Ileostomy

Answer

Left hemicolectomy

Answer

Total colectomy

Question 10

What is the treatment of choice for a 70-year-old male patient presenting with peritonitis secondary to ruptured diverticulitis?

Accepted Answer

Hamann's procedure

Answer

Conservative management

Answer

Primary resection and anastomosis

Answer

Whipple procedure

Colorectal Surgery — MCQs

Colorectal Surgery — MCQs

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