Gastrointestinal Surgery Practice Questions

Q: Which of the following is NOT a complication of trichobezoars?

Malignancy. **Explanation:** A **trichobezoar** is a mass of undigested hair trapped in the gastrointestinal tract, typically seen in young females with psychiatric conditions like trichotillomania (hair-pulling) and trichophagia (hair-eating). **Why Malignancy is the Correct Answer:** There is no clinical evidence or pathophysiological mechanism linking trichobezoars to the development of gastrointestinal **malignancy**. Bezoars act as chronic foreign bodies causing mechanical and chemical irritation, but they do not induce neoplastic transformation of the gastric or intestinal mucosa. **Analysis of Incorrect Options:** * **Obstruction (C):** This is the most common complication. The hairball can grow to fill the entire stomach or break off into pieces (Rapunzel syndrome), causing gastric outlet obstruction or small bowel obstruction. * **Perforation and Peritonitis (B):** Constant pressure from the heavy, enlarging mass can lead to pressure necrosis of the gastric wall, resulting in ulceration, perforation, and subsequent peritonitis. * **Haematemesis (A):** The rough texture of the hair mass causes chronic friction against the gastric mucosa, leading to "bezoar-induced" gastric ulcers. These ulcers can erode into mucosal vessels, causing upper GI bleeding and haematemesis. **High-Yield Clinical Pearls for NEET-PG:** * **Rapunzel Syndrome:** A rare form of trichobezoar where the "tail" of the hair mass extends from the stomach into the small intestine (jejunum/ileum). * **Clinical Presentation:** Often presents with a palpable, firm, non-tender epigastric mass, halitosis (due to decaying food trapped in the hair), and patchy alopecia. * **Diagnosis:** **Contrast CT scan** is the investigation of choice (shows a mottled gas pattern/mottled mass). * **Management:** Large trichobezoars usually require **laparotomy and gastrotomy**, as they are often too large and dense for endoscopic removal.

Q: What is the ideal treatment for a 3.4 cm carcinoid tumor of the appendix?

Right hemicolectomy. **Explanation:** The management of appendiceal carcinoid tumors (neuroendocrine tumors) is primarily determined by the **size of the tumor** and its location. 1. **Why Right Hemicolectomy is correct:** For appendiceal carcinoids, an appendectomy is sufficient if the tumor is 2 cm** (as in this case, 3.4 cm), because the risk of nodal metastasis increases significantly with size. Other indications for right hemicolectomy regardless of size include involvement of the base of the appendix, mesoappendiceal invasion, or high-grade histology (Goblet cell carcinoid). 2. **Why other options are incorrect:** * **Radiotherapy & Chemotherapy:** Carcinoid tumors are generally slow-growing (indolent) and are notoriously resistant to conventional radiotherapy and chemotherapy. Surgery remains the mainstay of treatment for localized disease. * **Observation:** This is inappropriate for a 3.4 cm mass due to the high risk of malignancy and lymphatic spread. Observation is only considered for very small, incidentally found tumors post-appendectomy that meet all low-risk criteria. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site** of carcinoid tumors in the GI tract: **Ileum** (though historically often cited as Appendix in older texts; current data suggests Small Bowel > Rectum > Appendix). * **Most common site within the appendix:** The **tip** (distal third). * **Carcinoid Syndrome:** Usually occurs only when there are **liver metastases** (bypassing portal circulation). * **Tumor Marker:** **Chromogranin A** (most sensitive) and 24-hour urinary **5-HIAA**. * **Diagnostic Rule of Thumb:** * 2 cm: Right Hemicolectomy.

Q: What is the commonest cause of acute mesenteric adenitis?

Idiopathic. **Explanation:** **Acute Mesenteric Adenitis** is a clinical condition characterized by the inflammation of mesenteric lymph nodes, often mimicking acute appendicitis. **Why "Idiopathic" is the correct answer:** In the majority of clinical cases, no specific causative organism is identified, making **Idiopathic** the most common classification. When a cause is identified, it is most frequently associated with a **viral upper respiratory tract infection** (e.g., Adenovirus, Enterovirus). Among bacterial causes, *Yersinia enterocolitica* is the most common specific pathogen, but overall, non-specific/idiopathic cases predominate in clinical practice. **Analysis of Incorrect Options:** * **A. Tuberculosis:** While abdominal TB is a significant cause of chronic mesenteric lymphadenopathy in developing countries, it typically presents with a chronic course rather than the acute, self-limiting presentation of mesenteric adenitis. * **B. Brucellosis:** This is a zoonotic infection that can cause lymphadenopathy and systemic symptoms, but it is a rare cause of acute abdominal pain compared to viral or idiopathic triggers. * **C. Pneumococcal infection:** *Streptococcus pneumoniae* is a common cause of primary peritonitis (especially in children with nephrotic syndrome or cirrhosis), but it is not a primary cause of mesenteric adenitis. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Presentation:** Typically affects children and adolescents; presents with RLQ pain, fever, and tenderness. * **Key Diagnostic Feature:** Unlike appendicitis, the pain in mesenteric adenitis is often **shifting** (the point of maximum tenderness moves when the patient is turned from side to side—**Klein’s Sign**). * **Diagnosis:** Ultrasound is the investigation of choice, showing enlarged lymph nodes (>8mm in short axis) with a normal appendix. * **Management:** It is a self-limiting condition; treatment is conservative (analgesics and hydration).

Q: A 26-year-old male presents with acute right lower quadrant abdominal pain. Appendicitis is suspected, and an ultrasound is equivocal. What is the next most appropriate investigation?

CT scan. **Explanation:** The clinical presentation is highly suggestive of **Acute Appendicitis**. In cases where the clinical diagnosis is uncertain or the initial ultrasound (USG) is equivocal, **Contrast-Enhanced Computed Tomography (CECT)** is the gold standard and the next most appropriate investigation. **1. Why CT Scan is the Correct Answer:** CT scan has a very high sensitivity (>94%) and specificity (>95%) for diagnosing appendicitis. It is superior to USG in identifying secondary signs (fat stranding, phlegmon, or abscess) and visualizing a retrocecal appendix, which is often missed on ultrasound. In adult males and non-pregnant females, it is the investigation of choice to confirm the diagnosis and rule out differentials. **2. Why Other Options are Incorrect:** * **Plain X-ray:** It is non-specific. While it may show a fecalith (in <10% of cases) or localized ileus, it cannot confirm or exclude appendicitis. Its primary use is to rule out perforation (pneumoperitoneum). * **Serum ESR:** This is a non-specific marker of inflammation. While it may be elevated, it does not provide a localized diagnosis and cannot differentiate appendicitis from other inflammatory conditions. * **MRI Abdomen:** While highly accurate, MRI is expensive and not readily available in emergency settings. It is typically reserved as the second-line investigation for **pregnant women** or pediatric patients when USG is inconclusive, to avoid radiation. **Clinical Pearls for NEET-PG:** * **Most common position of the appendix:** Retrocecal (74%). * **Most common cause of appendicitis:** Fecalith (adults); Lymphoid hyperplasia (children). * **Alvarado Score:** A clinical scoring system where a score of **≥7** is highly suggestive of appendicitis. * **Investigation of Choice (IOC):** USG is the initial investigation (especially in children/pregnant women), but **CT scan** is the most accurate and definitive investigation in adults.

Q: A 26-year-old male presents with a painless swelling over the umbilicus. What is the most probable diagnosis?

Umbilical hernia. ### **Explanation** The correct answer is **B. Umbilical hernia**. **1. Why Umbilical Hernia is Correct:** In an adult, a painless swelling at the umbilicus is most commonly an **acquired umbilical hernia**. This occurs due to a defect in the linea alba at the umbilical cicatrix. In adults, it is often "para-umbilical," where the protrusion occurs through a weakness just above or below the umbilical ring. The clinical presentation of a soft, reducible, and painless lump that increases with intra-abdominal pressure (like coughing or straining) is classic for this condition. **2. Why Other Options are Incorrect:** * **A. Omphalitis:** This refers to an infection of the umbilical stump. It presents with signs of inflammation such as redness (erythema), warmth, tenderness, and often purulent discharge. It is not a "painless swelling." * **C. Omphalocele:** This is a **congenital** ventral wall defect seen at birth where abdominal contents protrude through the umbilical ring, covered by a peritoneal sac. It is not a diagnosis for a 26-year-old. * **D. Gastroschisis:** This is also a **congenital** defect, typically occurring to the right of the umbilicus, where bowel loops protrude without a covering sac. Like omphalocele, this is diagnosed in neonates, not adults. **3. NEET-PG High-Yield Pearls:** * **Adult vs. Pediatric:** Pediatric umbilical hernias often close spontaneously by age 2; adult umbilical hernias never resolve spontaneously and carry a higher risk of **strangulation** due to the narrow neck of the sac. * **Risk Factors:** In adults, it is associated with conditions that increase intra-abdominal pressure, such as obesity, pregnancy, and ascites (e.g., Cirrhosis—Caput Medusae). * **Mayo’s Operation:** Historically used for repair (vest-over-pants repair), though modern standards prefer tension-free mesh hernioplasty.

Q: Which of the following are risk factors for inguinal hernia?

All of the above. **Explanation:** The development of an inguinal hernia is primarily driven by two mechanisms: **increased intra-abdominal pressure** and **weakness of the abdominal wall musculature/collagen.** 1. **COPD (Chronic Obstructive Pulmonary Disease):** Patients with COPD suffer from a chronic cough. This repetitive, forceful contraction of the abdominal muscles leads to sustained increases in intra-abdominal pressure, which pushes peritoneal contents through weak points like the internal ring or Hesselbach’s triangle. 2. **BPH (Benign Prostatic Hyperplasia):** BPH causes bladder outlet obstruction, forcing the patient to use the **Valsalva maneuver** (straining) to void. This chronic straining significantly raises intra-abdominal pressure, making it a classic risk factor for hernia development in elderly males. 3. **Cigarette Smoking:** Smoking is a systemic risk factor. It contributes in two ways: it induces a chronic cough (increasing pressure) and, more importantly, it alters **collagen metabolism**. Smoking increases elastase activity and decreases protease inhibitors, leading to the degradation of Type I and Type III collagen, which weakens the transversalis fascia. **Clinical Pearls for NEET-PG:** * **Most common type:** Indirect inguinal hernia is the most common type in both males and females. * **The "Gold Standard" Repair:** Lichtenstein tension-free mesh repair. * **Nyhus Classification:** Frequently tested; remember that Type IIIa is a Direct hernia and Type IIIb is an Indirect hernia with a large internal ring (sliding/pantaloon). * **Other Risk Factors:** Ascites, pregnancy, heavy lifting, and previous lower abdominal incisions (incisional hernia).

Question 1

In cases of upper GI bleed associated with stress gastritis, which of the following statements is NOT true?

Accepted Answer

Surgery involves anterior gastrotomy with ligation of bleeding ulcers and superficial erosions.

Answer

Surgery should be performed if transfusion requirements exceed 6 units.

Answer

Vagotomy may be added.

Answer

Total gastrectomy is rarely indicated.

Question 2

A 20-year-old man presents with severe right lower quadrant abdominal pain, nausea, and anorexia. The abdominal pain started around his umbilicus and has now migrated to the right lower quadrant. Physical examination reveals exquisite tenderness at McBurney's point. This patient is diagnosed with acute appendicitis. What is the recommended treatment for this condition?

Accepted Answer

Surgical resection of the appendix, because appendicitis can lead to perforation or abscess

Answer

Antibiotics only, because the appendix is crucial for survival

Answer

Surgical resection of the appendix, because appendicitis can lead to appendiceal cancer

Answer

A 'watch-and-wait' approach over days to see if inflammation subsides

Question 3

Which of the following is NOT a complication of trichobezoars?

Accepted Answer

Malignancy

Answer

Haematemesis

Answer

Perforation and peritonitis

Answer

Obstruction

Question 4

What is the ideal treatment for a 3.4 cm carcinoid tumor of the appendix?

Accepted Answer

Right hemicolectomy

Answer

Radiotherapy

Answer

Chemotherapy

Answer

Observation

Question 5

What is the commonest cause of acute mesenteric adenitis?

Accepted Answer

Idiopathic

Answer

Tuberculosis

Answer

Brucellosis

Answer

Pneumococcal infection

Question 6

A 26-year-old male presents with acute right lower quadrant abdominal pain. Appendicitis is suspected, and an ultrasound is equivocal. What is the next most appropriate investigation?

Accepted Answer

CT scan

Answer

Plain X-ray

Answer

Serum ESR

Answer

MRI abdomen

Question 7

A 26-year-old male presents with a painless swelling over the umbilicus. What is the most probable diagnosis?

Accepted Answer

Umbilical hernia

Answer

Omphalitis

Answer

Omphalocele

Answer

Gastroschisis

Question 8

Why does acute appendicitis in elderly patients and in children generally have a worse prognosis?

Accepted Answer

The omentum and peritoneal cavity appear to be less efficient in localizing the disease in these age groups.

Answer

The appendix is retrocecal.

Answer

The appendix is in the perineal position.

Answer

The appendix is in the pelvic position.

Question 9

Which of the following are risk factors for inguinal hernia?

Accepted Answer

All of the above

Answer

COPD

Answer

BPH

Answer

Cigarette smoking

Question 10

A 56-year-old woman has not passed stools for the last 14 days. X-ray shows no air-fluid levels. What is the probable diagnosis?

Accepted Answer

Intestinal pseudo-obstruction

Answer

Paralytic ileus

Answer

Aganglionosis of the colon

Answer

Duodenal obstruction

Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery — MCQs

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