Colorectal Surgery Practice Questions

Q: A 28-year-old woman recently treated as an outpatient for pelvic inflammatory disease presents with fever, leukocytosis, and deep rectal pain. In which space is this lesion?

Supralevator space. ***Supralevator space*** - **Pelvic inflammatory disease** can spread downward through the **pouch of Douglas** to form a **supralevator abscess**, presenting with deep rectal pain and systemic symptoms. - The **supralevator space** lies above the levator ani muscle and communicates with the **pelvis**, making it susceptible to infections spreading from **gynecologic sources**. *Perianal space* - **Perianal abscesses** arise from **infected anal glands** or **cryptoglandular disease**, not from pelvic infections. - They present as **superficial, painful swellings** around the **anal verge** with localized tenderness, not deep rectal pain. *Levator ani muscle* - The **levator ani muscle** itself is not a space where abscesses typically form. - **Muscle infections** would present with **myositis** symptoms rather than the classic abscess presentation described. *Intermuscular space* - **Intermuscular abscesses** occur between the **internal and external anal sphincters** due to **cryptoglandular infections**. - They present with **perianal pain** and **tenderness** rather than deep rectal pain, and are unrelated to **pelvic inflammatory disease**.

Q: A 65-year-old woman with a history of chronic constipation presents with abdominal pain and marked abdominal distention. On examination, her abdomen is distended and tender in the left lower quadrant. What is the most likely diagnosis?

Volvulus of the sigmoid colon. **Explanation:** The clinical presentation of a 65-year-old patient with chronic constipation, acute abdominal pain, and marked distention is classic for **Sigmoid Volvulus**. **1. Why Sigmoid Volvulus is correct:** Sigmoid volvulus involves the twisting of the sigmoid colon around its mesenteric axis. It typically occurs in elderly patients with a history of chronic constipation, which leads to a redundant, heavy, and dilated sigmoid colon—a prerequisite for torsion. The hallmark clinical features are **marked abdominal distention** (often more prominent than in other obstructions) and tenderness, frequently localized to the **left lower quadrant** where the sigmoid is situated. **2. Why the other options are incorrect:** * **Appendicitis:** Usually presents in younger patients with periumbilical pain migrating to the right iliac fossa. While it causes tenderness, it does not typically cause "marked abdominal distention" unless complicated by generalized peritonitis. * **Carcinoma of the colon:** While a common cause of obstruction in the elderly, it usually presents more subacutely with weight loss and altered bowel habits. It is a common *predisposing* factor for volvulus but is not the primary diagnosis for sudden, massive distention. * **Volvulus of the cecum:** This typically occurs in younger patients (30–50 years) due to an abnormally mobile cecum. The pain and distention are usually more prominent on the right side of the abdomen. **Clinical Pearls for NEET-PG:** * **X-ray Finding:** Look for the **"Coffee Bean sign"** or "Omega sign" (dilated sigmoid loop). * **Barium Enema:** Shows the **"Bird’s Beak"** or "Ace of Spades" appearance. * **Management:** The initial treatment of choice for stable patients is **Sigmoidoscopic detorsion** (using a flatus tube). If gangrene is suspected or detorsion fails, emergency surgery (Hartmann’s procedure) is required.

Q: A patient with an abdominal wall desmoid tumor should also be screened for which of the following?

Colonic polyps. **Explanation:** The correct answer is **Colonic polyps**. This association is based on the clinical link between **Desmoid tumors** and **Familial Adenomatous Polyposis (FAP)**, specifically a variant known as **Gardner Syndrome**. **Why Colonic Polyps?** Desmoid tumors are benign but locally aggressive fibroblastic neoplasms. While most are sporadic, approximately 10–15% are associated with FAP. FAP is caused by a germline mutation in the **APC (Adenomatous Polyposis Coli) gene**. In Gardner Syndrome (a subtype of FAP), patients present with a triad of: 1. **Colonic Polyposis:** Thousands of adenomatous polyps with a 100% risk of progression to colorectal cancer. 2. **Desmoid Tumors:** Often occurring in the abdominal wall or mesentery (frequently post-surgery). 3. **Extra-colonic manifestations:** Osteomas (usually of the mandible), epidermoid cysts, and dental abnormalities. Therefore, any patient presenting with a desmoid tumor must be screened via colonoscopy to rule out underlying FAP. **Why other options are incorrect:** * **Pancreatic/Gastric/Ovarian tumors:** While FAP can be associated with other malignancies (like duodenal carcinoma or papillary thyroid cancer), the classic, high-yield association for desmoid tumors in surgical exams is colonic polyposis. These other organs are not part of the diagnostic triad for Gardner Syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Gardner Syndrome Triad:** Polyposis + Osteomas + Soft tissue tumors (Desmoids/Sebaceous cysts). * **Turcot Syndrome:** Polyposis + CNS tumors (Medulloblastoma/Glioblastoma). * **Desmoid Management:** They do not metastasize but have high local recurrence rates. Wide local excision is the primary treatment, though medical therapy (NSAIDs, Tamoxifen) is sometimes used. * **CHRPE:** Congenital Hypertrophy of Retinal Pigment Epithelium is the earliest extra-colonic sign of FAP.

Q: Which of the following statements is NOT true regarding familial polyposis coli?

It is inherited in an autosomal recessive pattern.. ### Explanation **1. Why Option A is the Correct Answer (The False Statement):** Familial Adenomatous Polyposis (FAP) is inherited in an **Autosomal Dominant** pattern, not recessive. It is caused by a germline mutation in the **APC (Adenomatous Polyposis Coli) gene** located on chromosome **5q21**. According to Knudson’s "two-hit hypothesis," an individual inherits one defective allele, and a somatic mutation in the second allele leads to the development of hundreds to thousands of adenomatous polyps. **2. Analysis of Other Options:** * **Option B (Associated with fibromas and osteomas):** This describes **Gardner Syndrome**, a variant of FAP. It includes intestinal polyposis plus extra-colonic manifestations like osteomas (commonly of the mandible), dental abnormalities, and soft tissue tumors (desmoid tumors, fibromas). * **Option C (Associated with brain tumors):** This describes **Turcot Syndrome**, another variant where FAP is associated with CNS malignancies (classically medulloblastoma). * **Option D (100% incidence of colon carcinoma):** This is a hallmark of FAP. If left untreated by prophylactic total proctocolectomy, the progression from adenoma to adenocarcinoma is inevitable, usually by the age of 40. **3. High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Requires >100 polyps on colonoscopy. * **Screening:** Starts at age **10–12 years** with annual flexible sigmoidoscopy. * **Extra-colonic Malignancy:** The second most common cause of death in FAP patients (after colorectal cancer) is **Periampullary Carcinoma** (Duodenal cancer). * **CHRPE:** Congenital Hypertrophy of Retinal Pigment Epithelium is a specific clinical sign seen on fundoscopy in FAP patients.

Q: What is the best surgical procedure for mid rectal carcinoma?

Anterior resection. **Explanation:** The surgical management of rectal carcinoma is primarily determined by the distance of the tumor from the anal verge and the ability to achieve a negative distal margin while preserving the anal sphincter. **Why Anterior Resection (AR) is correct:** The rectum is anatomically divided into the upper (10–15 cm), middle (5–10 cm), and lower (<5 cm) thirds. For **mid-rectal tumors**, the standard of care is **Anterior Resection (AR)** or Low Anterior Resection (LAR) with Total Mesorectal Excision (TME). Since the tumor is located in the mid-rectum, a safe distal margin (usually 1–2 cm) can be achieved without sacrificing the anal sphincters, allowing for a primary colorectal anastomosis and preservation of fecal continence. **Analysis of Incorrect Options:** * **Abdomino-perineal Resection (APR):** This involves the removal of the entire rectum and anal canal with a permanent colostomy. It is reserved for **low rectal cancers** (distal 1/3rd) where the tumor invades the sphincter complex or where a safe distal margin cannot be obtained. * **Perineal Loop:** This is not a standard oncological procedure for rectal carcinoma. * **Transverse Colostomy:** This is a palliative or diverting procedure used to relieve obstruction; it does not treat the primary malignancy. **NEET-PG High-Yield Pearls:** * **Total Mesorectal Excision (TME):** The "gold standard" technique for middle and lower rectal cancers to reduce local recurrence. * **Safe Distal Margin:** 5 cm for upper rectal, 2 cm for mid/lower rectal, and 1 cm for some low-grade distal tumors. * **Restorative Proctectomy:** Always preferred over APR if the sphincter can be saved. * **Neoadjuvant Chemoradiotherapy:** Indicated for T3/T4 or Node-positive (Stage II/III) rectal cancers to downstage the tumor before surgery.

Q: All are true about Gardner's syndrome EXCEPT?

Onset always in the 5th decade of life. **Explanation:** Gardner’s syndrome is a phenotypic variant of **Familial Adenomatous Polyposis (FAP)**, characterized by the triad of colonic polyposis, soft tissue tumors, and skeletal abnormalities. It is an autosomal dominant condition caused by a mutation in the **APC gene** on chromosome 5q21. **Why Option B is the Correct Answer (The Exception):** The onset of Gardner’s syndrome is **not** in the 5th decade. Colonic polyps typically appear in the **second decade** (teens), and if left untreated, progression to colorectal carcinoma occurs in nearly 100% of patients by the **fourth decade** (age 40). Waiting until the 5th decade for screening or diagnosis would be fatal. **Analysis of Other Options:** * **A. Protein-losing enteropathy:** Extensive polyposis in the GI tract can lead to significant protein loss through the stool, resulting in hypoalbuminemia. * **C. Presence of small intestine polyps:** While colonic polyps are hallmark, patients frequently develop polyps in the duodenum (especially periampullary) and the ileum. * **D. Malignancy is common:** Colorectal cancer is an inevitable outcome without prophylactic colectomy. There is also an increased risk of duodenal carcinoma and desmoid tumors. **NEET-PG High-Yield Pearls:** * **Extra-colonic manifestations:** Osteomas (usually of the mandible/skull), dental abnormalities (supernumerary teeth), desmoid tumors, and Epidermoid cysts. * **CHRPE:** Congenital Hypertrophy of Retinal Pigment Epithelium is a highly specific clinical marker for FAP/Gardner’s. * **Turcot Syndrome:** Association of FAP with CNS tumors (Medulloblastoma). * **Management:** Prophylactic Total Proctocolectomy is the treatment of choice.

Q: All are true regarding rectal carcinoma EXCEPT?

Adenocarcinoma is a rare variant of rectal carcinoma.. **Explanation** The correct answer is **B**, as it is a false statement. **Adenocarcinoma** is not a rare variant; it is the **most common histological type** of rectal carcinoma, accounting for approximately 90–95% of all cases. Other types, such as squamous cell carcinoma (usually at the anorectal junction) or lymphomas, are significantly rarer. **Analysis of other options:** * **Option A:** Early morning spurious diarrhea (the passage of mucus and blood upon waking) and tenesmus (a constant feeling of needing to evacuate the bowels) are classic clinical features of rectal cancer caused by the irritating effect of the tumor on the rectal mucosa. * **Option C:** According to **Modified Duke’s Staging (Astler-Coller)**, Stage A refers to a tumor limited to the mucosa. (Note: Duke’s Stage A originally referred to growth limited to the bowel wall, but modified versions specify mucosal/submucosal involvement). * **Option D:** **Hartmann’s operation** (often misspelled as Hamann's in some question banks) involves resection of the affected rectosigmoid with a proximal end colostomy and closure of the distal rectal stump. It is preferred in elderly, debilitated patients or in emergency settings (perforation/obstruction) where a primary anastomosis is too risky. **High-Yield NEET-PG Pearls:** * **Gold Standard Investigation:** Contrast-enhanced MRI (Pelvis) is the investigation of choice for local staging (T and N staging) of rectal cancer. * **Distance from Anal Verge:** Lower third (<5 cm), Middle third (5–10 cm), Upper third (10–15 cm). * **Surgical Choice:** Low Anterior Resection (LAR) is for upper/middle rectal tumors; Abdominoperineal Resection (APR/Miles' Operation) is for very low tumors involving the sphincter. * **Most common site of distant metastasis:** Liver (via portal circulation).

Question 1

A 28-year-old woman recently treated as an outpatient for pelvic inflammatory disease presents with fever, leukocytosis, and deep rectal pain. In which space is this lesion?

Accepted Answer

Supralevator space

Answer

Perianal space

Answer

Levator ani muscle

Answer

Intermuscular space

Question 2

A 65-year-old woman with a history of chronic constipation presents with abdominal pain and marked abdominal distention. On examination, her abdomen is distended and tender in the left lower quadrant. What is the most likely diagnosis?

Accepted Answer

Volvulus of the sigmoid colon

Answer

Appendicitis

Answer

Carcinoma of the colon

Answer

Volvulus of the cecum

Question 3

Recurrent rectal prolapse in elderly patients is typically treated by which of the following surgical procedures?

Accepted Answer

Thiersch wiring

Answer

Digital reposition

Answer

Excision

Answer

Ripstein's operation

Question 4

A patient with an abdominal wall desmoid tumor should also be screened for which of the following?

Accepted Answer

Colonic polyps

Answer

Pancreatic tumors

Answer

Gastric tumors

Answer

Ovarian tumors

Question 5

Which of the following statements is NOT true regarding familial polyposis coli?

Accepted Answer

It is inherited in an autosomal recessive pattern.

Answer

It is associated with fibromas and osteomas.

Answer

It is associated with brain tumors.

Answer

It has a 100% incidence of colon carcinoma.

Question 6

What is the best surgical procedure for mid rectal carcinoma?

Accepted Answer

Anterior resection

Answer

Abdomino perineal resection

Answer

Perineal loop

Answer

Transverse Colostomy

Question 7

All are true about Gardner's syndrome EXCEPT?

Accepted Answer

Onset always in the 5th decade of life

Answer

Protein losing enteropathy

Answer

Presence of small intestine polyps

Answer

Malignancy is common

Question 8

Which of the following statements regarding colostomy is true?

Accepted Answer

Double-barreled colostomy is commonly done nowadays.

Answer

A colostomy is an artificial opening made in the large bowel to divert feces to the exterior.

Answer

Temporary colostomy is established to defunction and allow anastomosis.

Answer

Permanent colostomy is formed after the resection of the rectum by the abdominoperineal technique.

Question 9

All are true regarding rectal carcinoma EXCEPT?

Accepted Answer

Adenocarcinoma is a rare variant of rectal carcinoma.

Answer

Early morning spurious diarrhea and tenesmus can occur.

Answer

Growth confined to the rectal mucosa is stage A of modified Duke's staging.

Answer

Hamann's operation is done in old debilitated patients.

Question 10

Prophylactic polypectomy is indicated in which of the following conditions?

Accepted Answer

None of the above

Answer

Peutz-Jeghers syndrome

Answer

Gardner's syndrome

Answer

Familial polyposis coli

Colorectal Surgery — MCQs

Colorectal Surgery — MCQs

On this page

Practice by Chapter

Want unlimited practice?