Colorectal Surgery Practice Questions

Q: A 22-year-old male patient presents with complete rectal prolapse. What is the surgery of choice?

Abdominal rectopexy. **Explanation:** The management of complete rectal prolapse (full-thickness protrusion) is primarily determined by the patient’s age, comorbidities, and fitness for surgery. **1. Why Abdominal Rectopexy is Correct:** In a **young, fit patient** (like this 22-year-old), the **Abdominal Rectopexy** (specifically Laparoscopic Rectopexy) is the gold standard and surgery of choice. Abdominal approaches have significantly **lower recurrence rates** (0–10%) compared to perineal approaches. The procedure involves mobilizing the rectum and fixing it to the sacral promontory, often using mesh (Wells or Ripstein procedure) or sutures (Suture Rectopexy). **2. Why the other options are incorrect:** * **Delorme’s Procedure (Option A):** This is a perineal approach involving mucosal proctectomy and plication of the rectal muscle. It is reserved for elderly, frail patients or those with short-segment prolapse because it has a high recurrence rate (up to 20-30%). * **Altemeier’s Procedure (Options C & D):** Also known as perineal proctosigmoidectomy, this involves a full-thickness resection of the prolapsed bowel via the perineum. While it is the preferred perineal procedure for patients unfit for general anesthesia, it is not the first choice for a young, healthy male due to higher recurrence compared to abdominal rectopexy. **Clinical Pearls for NEET-PG:** * **Gold Standard:** Laparoscopic Abdominal Rectopexy (lowest recurrence). * **Frykman-Goldberg Procedure:** Abdominal rectopexy + Sigmoid colectomy (indicated if the patient has significant pre-existing constipation). * **Thiersch Wiring:** A historical, palliative procedure using a perianal ring; now largely obsolete. * **Key Anatomical Defect:** Complete rectal prolapse is considered a **sliding hernia** through the Pouch of Douglas, associated with a patulous anus and deep rectovesical/rectouterine pouch.

Q: A 60-year-old male presents with a reducible rectal mass that protrudes during defecation and straining. On examination, a full-thickness protrusion through the anus is noted with concentric mucosal folds and a palpable sulcus. He is considered a high anesthetic risk. What is the preferred surgical treatment?

Delorme procedure. ***Delorme procedure*** - **Perineal approach** ideal for **high anesthetic risk** patients as it avoids general anesthesia and abdominal surgery complications. - Involves **mucosal stripping** and **muscle plication** through the anus, making it safer for elderly or frail patients with **complete rectal prolapse**. *Frykman-Goldberg procedure* - **Abdominal approach** requiring **general anesthesia** and laparotomy, unsuitable for high-risk patients. - Combines **posterior mesh fixation** with **sigmoid resection**, carrying higher perioperative risks. *Well's procedure* - **Transabdominal approach** with **anterior sling** and **sigmoid resection**, requiring general anesthesia. - Higher morbidity and mortality risk compared to perineal procedures in **elderly high-risk** patients. *Ripstein procedure* - **Abdominal approach** using **posterior mesh wrap** around the rectum, requiring general anesthesia. - Risk of **mesh erosion** and **constipation** due to rectal constriction, plus unsuitable for high anesthetic risk patients.

Q: Which of the following statements regarding Familial Adenomatous Polyposis (FAP) is FALSE?

Colon cancer usually develops around 20 years of age.. **Explanation:** Familial Adenomatous Polyposis (FAP) is an autosomal dominant condition caused by a mutation in the **APC (Adenomatous Polyposis Coli) gene** on chromosome 5q21. **Why Option D is the Correct (False) Statement:** While polyps begin to appear in the second decade of life (average age 16 years), colon cancer does not typically develop until later. The average age for the development of colorectal cancer in untreated FAP patients is **39–40 years**. Developing cancer at age 20 is rare; however, because the risk becomes nearly 100% by age 40-50, prophylactic proctocolectomy is usually recommended in the late teens or early twenties. **Analysis of Other Options:** * **Option A:** FAP is indeed the **most common** hereditary polyposis syndrome, affecting approximately 1 in 10,000 to 15,000 live births. * **Option B:** The clinical diagnosis of classic FAP requires the presence of **>100 adenomatous polyps**. In many cases, thousands of polyps carpet the colon. * **Option C:** Without surgical intervention (prophylactic colectomy), the progression from adenoma to carcinoma is inevitable, with a lifetime risk of **nearly 100%**. **NEET-PG High-Yield Pearls:** * **Extracolonic Manifestations:** Duodenal adenomas (most common cause of death post-colectomy), desmoid tumors, osteomas, and CHRPE (Congenital Hypertrophy of Retinal Pigment Epithelium). * **Gardner’s Syndrome:** FAP + Osteomas + Soft tissue tumors (sebaceous cysts, desmoids). * **Turcot’s Syndrome:** FAP + CNS tumors (Medulloblastoma). * **Screening:** Starts at age **10–12 years** with annual flexible sigmoidoscopy.

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.

Question 1

A 22-year-old male patient presents with complete rectal prolapse. What is the surgery of choice?

Accepted Answer

Abdominal rectopexy

Answer

Delorme's procedure

Answer

Altemeier rectopexy

Answer

Altemeier rectopexy

Question 2

A 60-year-old male presents with a reducible rectal mass that protrudes during defecation and straining. On examination, a full-thickness protrusion through the anus is noted with concentric mucosal folds and a palpable sulcus. He is considered a high anesthetic risk. What is the preferred surgical treatment?

Accepted Answer

Delorme procedure

Answer

Frykman-Goldberg procedure

Answer

Well's procedure

Answer

Ripstein procedure

Question 3

What is the primary risk associated with acute mechanical large bowel obstruction that necessitates early surgical intervention?

Accepted Answer

Development of a closed-loop obstruction leading to cecal perforation

Answer

Respiratory compromise secondary to abdominal distension

Answer

Fluid and electrolyte derangements resulting from vomiting

Answer

Bacteremia or sepsis originating from intestinal contents

Question 4

Which type of malignancy is most commonly associated with an anorectal fistula?

Accepted Answer

Squamous cell carcinoma

Answer

Transitional cell carcinoma

Answer

Adenocarcinoma

Answer

Columnar cell carcinoma

Question 5

Which of the following statements regarding Familial Adenomatous Polyposis (FAP) is FALSE?

Accepted Answer

Colon cancer usually develops around 20 years of age.

Answer

It is the most common genetic polyposis syndrome.

Answer

More than 100 polyps may be present in the colon.

Answer

The risk of developing colon cancer is 90-100%.

Question 6

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 7

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 8

Gardner's syndrome is associated with all except?

Accepted Answer

Brain tumor

Answer

Sebaceous cyst

Answer

Desmoid tumor

Answer

Bony exostosis

Question 9

What is the most common site of colon cancer?

Accepted Answer

Rectosigmoid region

Answer

Ascending colon

Answer

Descending colon

Answer

Transverse colon

Question 10

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

Colorectal Surgery — MCQs

Colorectal Surgery — MCQs

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