Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 941: Massive bleeding per rectum in a 70-year-old patient is most commonly due to which of the following conditions?

A. Diverticulosis (Correct Answer)
B. Carcinoma of the colon
C. Colitis
D. Polyps

Explanation: **Explanation:** **1. Why Diverticulosis is Correct:** In elderly patients (typically >60 years), **Diverticulosis** is the most common cause of **painless, massive lower gastrointestinal bleeding (LGIB)**. The bleeding occurs because the vasa recta (small nutrient arteries) become draped over the dome of the diverticulum. Over time, chronic injury and eccentric thickening of the intima lead to arterial rupture into the colonic lumen. Although diverticula are more common in the left colon, bleeding more frequently originates from the **right colon** (approximately 50-90% of cases). **2. Why Other Options are Incorrect:** * **Carcinoma of the colon:** While a common cause of LGIB in the elderly, it typically presents as **chronic, occult bleeding** leading to iron deficiency anemia, rather than acute massive hemorrhage. * **Colitis (Ulcerative/Ischemic):** Bleeding is usually associated with diarrhea, abdominal pain, and tenesmus. It is rarely "massive" or "painless" in the initial presentation. * **Polyps:** These generally cause intermittent, low-grade bright red blood per rectum or are detected via occult blood testing; they do not typically cause massive exsanguination. **3. Clinical Pearls for NEET-PG:** * **Most common cause of LGIB in adults:** Diverticulosis. * **Most common cause of LGIB in children:** Meckel’s Diverticulum. * **Management:** 70-80% of diverticular bleeds stop spontaneously with conservative management. * **Diagnostic Gold Standard:** Colonoscopy (after stabilization); however, if bleeding is too brisk, **Angiography** or a **Tagged RBC scan** is indicated. * **Angiodysplasia:** The second most common cause of massive LGIB in the elderly; often associated with Aortic Stenosis (Heyde’s Syndrome).

Question 942: Which neoadjuvant chemotherapy is used in esophageal cancer?

A. Cisplatin (Correct Answer)
B. Cyclophosphamide
C. Doxorubicin
D. Methotrexate

Explanation: **Explanation:** The management of esophageal cancer (both Squamous Cell Carcinoma and Adenocarcinoma) often involves a multimodal approach. For locally advanced stages (T2-T4 or N+), **neoadjuvant chemoradiotherapy (nCRT)** is the standard of care to downstage the tumor and improve R0 resection rates. **Cisplatin** (Option A) is the cornerstone of neoadjuvant regimens for esophageal cancer. It is a platinum-based alkylating agent that causes DNA cross-linking. The most widely used protocol is the **CROSS trial regimen**, which utilizes **Carboplatin and Paclitaxel** with concurrent radiotherapy. However, the classic **PF regimen (Cisplatin and 5-Fluorouracil)** remains a gold standard and a frequently tested alternative in surgical oncology. **Why other options are incorrect:** * **Cyclophosphamide (Option B):** An alkylating agent primarily used in lymphomas, leukemias, and breast cancer; it has no established role in the primary treatment of esophageal cancer. * **Doxorubicin (Option C):** An anthracycline used for sarcomas, breast cancer, and lymphomas. While used in some gastric cancer protocols (e.g., ECF), it is not a standard neoadjuvant choice for the esophagus. * **Methotrexate (Option D):** An antimetabolite used in hematological malignancies, osteosarcoma, and some head and neck cancers, but not in esophageal protocols. **High-Yield Clinical Pearls for NEET-PG:** * **Standard of Care:** Neoadjuvant Chemoradiotherapy (nCRT) followed by surgery (Esophagectomy). * **CROSS Trial Regimen:** Carboplatin + Paclitaxel + 41.4 Gy Radiotherapy. * **MAGIC Trial Regimen:** Perioperative ECF (Epirubicin, Cisplatin, 5-FU) is more commonly associated with gastroesophageal junction (GEJ) and gastric cancers. * **FLOT Regimen:** (Fluorouracil, Leucovorin, Oxaliplatin, and Docetaxel) is currently preferred over ECF for adenocarcinoma of the GEJ.

Question 943: Regarding the treatment of esophageal cancer, which statement is false?

A. Approximately 5% of patients survive 5 years after diagnosis.
B. The efficacy of primary radiation therapy for squamous cell carcinomas is similar to that of radical surgery.
C. Surgical resection of all gross tumor is feasible in only about 45% of cases.
D. Chemotherapy is highly effective and sometimes curative. (Correct Answer)

Explanation: ### Explanation **Why Option D is the Correct (False) Statement:** While chemotherapy plays a vital role in the multimodality management of esophageal cancer (neoadjuvant or palliative), it is **not highly effective as a standalone treatment** and is **rarely, if ever, curative**. Esophageal adenocarcinoma and squamous cell carcinoma (SCC) show only partial responses to current regimens (like FLOT or CROSS). Cure typically requires definitive local control via radical surgery or definitive chemoradiotherapy. **Analysis of Other Options:** * **Option A:** Esophageal cancer has a notoriously poor prognosis. Due to the lack of a serosa and early lymphatic spread, most patients present with advanced disease. The overall 5-year survival rate remains low, historically hovering around **5-15%**. * **Option B:** For **Squamous Cell Carcinoma (SCC)**, definitive radiotherapy (often combined with chemotherapy) has shown survival outcomes comparable to radical esophagectomy in several trials. This is why definitive CRT is a standard organ-preserving alternative for SCC, especially in the upper third of the esophagus. * **Option C:** Because of late presentation and local invasion into vital structures (aorta, tracheobronchial tree), only about **40-50%** of patients are candidates for an R0 resection (complete gross and microscopic removal) at the time of diagnosis. **Clinical Pearls for NEET-PG:** * **Most common site:** Worldwide, it is the middle third (SCC); in the West/increasingly in India, it is the lower third (Adenocarcinoma). * **Investigation of Choice:** Upper GI Endoscopy with biopsy. * **Staging Investigation:** Contrast-Enhanced CT (CECT) for distant metastasis; **Endoscopic Ultrasound (EUS)** is the most accurate for T and N staging. * **Standard Surgery:** Ivor-Lewis Esophagectomy (Right thoracotomy + Laparotomy) for middle and lower third lesions.

Question 944: Which one of the following is not a treatment of gastroesophageal variceal hemorrhage?

A. Sclerotherapy
B. Sengstaken tube
C. Transjugular intrahepatic portocaval shunt
D. Gastric freezing (Correct Answer)

Explanation: **Explanation:** The management of acute gastroesophageal variceal hemorrhage focuses on hemodynamic stabilization, pharmacological therapy (octreotide/terlipressin), and endoscopic intervention. **Why Gastric Freezing is the Correct Answer:** **Gastric freezing** is an obsolete technique introduced in the 1960s intended to treat **peptic ulcer disease** by reducing acid secretion through mucosal cooling. It has no role in the management of portal hypertension or variceal bleeding. In fact, it was found to be ineffective and associated with significant complications like gastric necrosis. **Analysis of Other Options:** * **Sclerotherapy (Endoscopic Sclerotherapy - EST):** This involves injecting sclerosants (e.g., ethanolamine oleate) into or around the varices to induce thrombosis and fibrosis. While Endoscopic Variceal Band Ligation (EVL) is now the preferred first-line treatment, EST remains a recognized therapeutic option. * **Sengstaken-Blakemore Tube:** This is a form of **balloon tamponade** used as a temporary "bridge" therapy in patients with massive bleeding that cannot be controlled endoscopically. It provides mechanical compression of the varices. * **Transjugular Intrahepatic Portosystemic Shunt (TIPS):** This is a radiological procedure that creates a low-resistance channel between the hepatic vein and the portal vein. It is indicated for refractory bleeding or as a rescue therapy when endoscopic and medical treatments fail. **Clinical Pearls for NEET-PG:** * **Drug of Choice (Acute Bleed):** Terlipressin (reduces portal pressure). * **Procedure of Choice (Acute Bleed):** Endoscopic Variceal Band Ligation (EVL). * **Prophylaxis:** Non-selective beta-blockers (Propranolol/Nadolol) are used for primary and secondary prophylaxis. * **TIPS Complication:** The most common metabolic complication after TIPS is **Hepatic Encephalopathy** due to the bypassing of the liver's detoxification function.

Question 945: A 50-year-old male presents with occasional dysphagia for solids, regurgitation of food, and foul-smelling breath. What is the probable diagnosis?

A. Achalasia cardia
B. Zenker's diverticulum (Correct Answer)
C. Carcinoma esophagus
D. Diabetic gastroparesis

Explanation: ### Explanation The clinical presentation of **dysphagia**, **regurgitation of undigested food**, and **halitosis** (foul-smelling breath) in an older male is a classic triad for **Zenker’s Diverticulum**. #### Why Zenker’s Diverticulum is Correct: Zenker’s diverticulum is a **pulsion pseudodiverticulum** occurring through **Killian’s dehiscence**—a weak area between the thyropharyngeus and cricopharyngeus muscles. The foul-smelling breath (halitosis) is a pathognomonic feature caused by the fermentation of undigested food trapped within the diverticular sac. Regurgitation often occurs when the patient lies down or stoops. #### Why Other Options are Incorrect: * **Achalasia Cardia:** While it presents with dysphagia and regurgitation, the dysphagia is typically for **both solids and liquids** from the onset (paradoxical dysphagia). Halitosis is less common than in Zenker’s. * **Carcinoma Esophagus:** This usually presents with **progressive** dysphagia (solids then liquids) and significant **weight loss** in an older age group. It does not typically cause the regurgitation of long-retained, undigested food seen here. * **Diabetic Gastroparesis:** This presents with postprandial fullness, nausea, and vomiting of food eaten hours prior, but it is a gastric motility issue and does not explain the specific pharyngeal symptoms or the anatomical "pouch" symptoms. #### NEET-PG High-Yield Pearls: * **Location:** It is a posterior protrusion in the midline. * **Diagnosis:** The investigation of choice is a **Barium Swallow** (shows a pouch). * **Management:** Small asymptomatic cases are observed; symptomatic cases require **Cricopharyngeal Myotomy** (with or without diverticulectomy) or endoscopic stapling (Dohlman’s procedure). * **Complication:** The most common serious complication is **aspiration pneumonia**.

Question 946: A patient complains of occasional vomiting of food particles eaten a few days ago. His wife reports that his breath smells foul. What is the most likely diagnosis?

A. Pyloric obstruction
B. Carcinoma of the stomach
C. Carcinoma of the esophagus
D. Achalasia cardiae (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Achalasia cardiae** The clinical presentation of **vomiting undigested food eaten days ago** combined with **halitosis (foul breath)** is a hallmark of advanced **Achalasia Cardiae**. In Achalasia, there is a failure of the Lower Esophageal Sphincter (LES) to relax and a lack of progressive peristalsis. This leads to massive dilatation of the esophagus (mega-esophagus). Food particles do not reach the stomach; instead, they stagnate in the dilated esophagus for days. Bacterial fermentation of this stagnant food results in the characteristic foul breath (halitosis). When the patient lies down or the esophagus reaches capacity, this undigested, non-acidic food is regurgitated. **Why other options are incorrect:** * **Pyloric Obstruction:** While this causes vomiting of food eaten previously, the vomitus is typically **acidic** (contains gastric juice) and may be projectile. Halitosis is less prominent compared to esophageal stasis. * **Carcinoma of the Stomach:** This usually presents with early satiety, weight loss, and hematemesis/melena. While gastric outlet obstruction can occur, the "days-old food" and primary halitosis are more classic for esophageal retention. * **Carcinoma of the Esophagus:** This primarily presents with **progressive dysphagia** (solids then liquids) and rapid weight loss. The esophagus rarely dilates enough to store food for "days" because the lumen is narrowed by a growth rather than a functional sphincter defect. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Esophageal Manometry (shows incomplete LES relaxation and aperistalsis). * **Barium Swallow:** Shows "Bird’s beak" or "Rat-tail" appearance. * **Heller’s Myotomy:** The surgical treatment of choice (usually combined with a partial fundoplication). * **Chagas Disease:** A common secondary cause of Achalasia (caused by *Trypanosoma cruzi*).

Question 947: Which of the following is true about stomach carcinoma?

A. Weight loss is the commonest feature. (Correct Answer)
B. Secondaries are most commonly seen in the peritoneum and omentum.
C. Lymphatic and hematogenous spread are rare.
D. Barium meal is diagnostic.

Explanation: **Explanation:** **1. Why Option A is Correct:** Weight loss is the most common presenting symptom of gastric carcinoma, occurring in approximately **70-90% of patients**. It results from a combination of anorexia (loss of appetite), early satiety, and the metabolic demands of the malignancy. While epigastric pain is also frequent, weight loss remains the hallmark feature of advanced presentation. **2. Why the other options are incorrect:** * **Option B:** The most common site for distant metastasis (hematogenous spread) in stomach cancer is the **liver**, not the peritoneum. While peritoneal seeding (carcinomatosis) is a known route of spread, it is not the "most common" secondary site compared to hepatic involvement. * **Option C:** Lymphatic and hematogenous spreads are **common**, not rare. Gastric cancer is notorious for early lymphatic spread to regional nodes (N-stages) and distant sites (e.g., Virchow’s node). * **Option D:** Barium meal is a screening/supportive tool but is **not diagnostic**. The gold standard for diagnosis is **Upper GI Endoscopy (UGIE) with biopsy**, which allows for direct visualization and histological confirmation. **Clinical Pearls for NEET-PG:** * **Most common site:** Antrum and pylorus (approx. 50-60%). * **Most common histological type:** Adenocarcinoma. * **Virchow’s Node:** Left supraclavicular lymphadenopathy (Troisier’s sign). * **Sister Mary Joseph’s Nodule:** Periumbilical metastasis. * **Krukenberg Tumor:** Metastasis to the ovary (usually bilateral), showing signet ring cells. * **Investigation of choice for staging:** Contrast-Enhanced CT (CECT) of the abdomen and pelvis. * **Investigation of choice for T-staging:** Endoscopic Ultrasound (EUS).

Question 948: Helicobacter pylori has been implicated in all of the following conditions except:

A. Gastric ulcer
B. Gastric carcinoma
C. Gastric lymphoma
D. Gastrointestinal stromal tumor (GIST) (Correct Answer)

Explanation: **Explanation:** The correct answer is **Gastrointestinal stromal tumor (GIST)** because its pathogenesis is unrelated to bacterial infection. GISTs are mesenchymal tumors arising from the **Interstitial Cells of Cajal (ICC)**, primarily driven by gain-of-function mutations in the **c-KIT proto-oncogene** (85%) or PDGFRA gene. **Why the other options are incorrect:** * **Gastric Ulcer:** *H. pylori* is the most common cause of peptic ulcer disease. It causes chronic inflammation, increasing gastrin secretion and damaging the mucosal barrier through ammonia and cytotoxins (CagA/VacA). * **Gastric Carcinoma:** *H. pylori* is classified as a **Type 1 Carcinogen** by the WHO. Chronic infection leads to a sequence of gastritis → intestinal metaplasia → dysplasia → adenocarcinoma (Correa’s pathway). * **Gastric Lymphoma:** Specifically, **MALToma** (Mucosa-Associated Lymphoid Tissue lymphoma) is strongly linked to *H. pylori*. The chronic antigenic stimulation by the bacteria leads to B-cell proliferation. Notably, early-stage MALToma can often be cured solely by *H. pylori* eradication therapy. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site for GIST:** Stomach (60%). * **GIST Marker:** CD117 (c-KIT) is the most specific immunohistochemical marker. * **Treatment of choice for GIST:** Surgical resection; Imatinib (Tyrosine Kinase Inhibitor) is used for metastatic or unresectable cases. * **H. pylori Eradication:** Standard triple therapy includes a PPI + Amoxicillin + Clarithromycin. * **Urease Breath Test:** The non-invasive gold standard for confirming *H. pylori* eradication.

Question 949: What is the most common indication for surgical intervention in intestinal tuberculosis?

A. Obstruction (Correct Answer)
B. Perforation
C. Mass in abdomen
D. Gastrointestinal symptoms

Explanation: **Explanation:** **Intestinal Tuberculosis (TB)** is a common extrapulmonary manifestation of TB, primarily affecting the ileocecal region. While the initial management for uncomplicated intestinal TB is medical (Anti-Tubercular Therapy), surgery is reserved for complications. **1. Why Obstruction is the Correct Answer:** Intestinal obstruction is the **most common complication** and the leading indication for surgery (occurring in approximately 15-60% of cases). Obstruction occurs due to: * **Healing of circumferential ulcers:** As TB ulcers heal, they form dense, fibrous **strictures** (the most common cause). * **Hyperplastic type TB:** This leads to a thickened bowel wall and a narrowed lumen. * **Adhesions:** Tuberculous peritonitis can cause dense adhesions or "cocooning" of the bowel. **2. Why Other Options are Incorrect:** * **B. Perforation:** This is the **most serious** and life-threatening complication, but it is less common than obstruction (occurring in 1-10% of cases). It usually presents as acute peritonitis. * **C. Mass in abdomen:** While a "doughy" abdomen or a palpable mass in the right iliac fossa (ileocecal TB) is a common clinical finding, it is not an indication for surgery unless it causes mechanical obstruction. * **D. Gastrointestinal symptoms:** Symptoms like abdominal pain, diarrhea, or weight loss are indications for medical ATT, not primary surgical intervention. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Ileocecal region (due to high density of lymphoid tissue/Peyer's patches and physiological stasis). * **Surgery of choice for strictures:** **Stricturoplasty** (to preserve bowel length) is preferred for multiple short strictures. * **Surgery for ileocecal TB:** Limited ileocecal resection or Right Hemicolectomy (if the segment is non-viable or extensively diseased). * **Stierlin’s Sign:** A radiological sign on barium meal showing rapid emptying of the inflamed terminal ileum into the cecum.

Question 950: The 'bent inner tube' sign is radiographically observed in which of the following conditions?

A. Volvulus (Correct Answer)
B. Intussusception
C. Intestinal obstruction
D. Gastric antral vascular ectasia

Explanation: **Explanation:** The **'bent inner tube' sign** (also known as the **'coffee bean' sign**) is a classic radiographic finding pathognomonic for **Sigmoid Volvulus**. This condition occurs when the sigmoid colon twists on its mesenteric axis, leading to a closed-loop obstruction. On an abdominal X-ray, the massively dilated, gas-filled sigmoid loop rises out of the pelvis, appearing as a smooth, U-shaped loop that resembles a bent inner tube or a coffee bean, with the "seam" representing the opposed inner walls of the dilated bowel. **Analysis of Options:** * **Volvulus (Correct):** Specifically Sigmoid Volvulus. The torsion creates a massive distension of the loop. Another key sign is the **'bird’s beak' appearance** seen on a gastrografin enema at the site of the twist. * **Intussusception:** Characterized radiographically by the **'target sign'** or **'pseudokidney sign'** on ultrasound, and the **'claw sign'** or **'coiled spring' appearance** on a barium enema. * **Intestinal Obstruction:** Small bowel obstruction typically presents with multiple **dilated central loops** and a **'step-ladder' pattern** of air-fluid levels, rather than a single massive U-shaped loop. * **Gastric Antral Vascular Ectasia (GAVE):** This is an endoscopic diagnosis, not a radiographic one. It is characterized by the **'watermelon stomach'** appearance due to longitudinal erythematous strips in the antrum. **High-Yield Clinical Pearls for NEET-PG:** * **Sigmoid Volvulus:** Most common in elderly, institutionalized, or psychiatric patients with chronic constipation. * **Management:** Initial treatment is **sigmoidoscopic detorsion** (using a flatus tube) unless gangrene is suspected. * **Cecal Volvulus:** Presents with a **'comma-shaped'** or **'fetal' appearance**, with the loop pointing toward the left upper quadrant.

Practice by Chapter

Esophageal Disorders

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Gastric Disorders

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Small Intestine Pathology

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Appendicitis

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Inflammatory Bowel Disease

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Intestinal Obstruction

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Gastrointestinal Bleeding

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Diverticular Disease

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Anorectal Disorders

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Colorectal Neoplasms

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Gastrointestinal Stomas

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Bariatric Surgery Principles

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