Gastrointestinal Surgery Practice Questions

Q: A 24-year-old man presents with symptoms of acute intestinal obstruction. His temperature is 38°C (101°F), respirations are 25 per minute, and blood pressure is 120/80 mm Hg. Physical examination reveals a mass in the right lower abdominal quadrant. Laparoscopy shows numerous small bowel strictures and a fistula extending into a loop of small bowel. Which of the following is the most likely diagnosis?

Crohn disease. ### Explanation **1. Why Crohn Disease is Correct:** The clinical presentation is classic for **Crohn Disease (CD)**. The patient is young (typical bimodal age distribution: 15–30 and 50–80 years) and presents with signs of **acute intestinal obstruction** and inflammation (fever, tachypnea). Key diagnostic features provided include: * **Transmural Inflammation:** Leads to the formation of **fistulas** (e.g., entero-enteric, as seen here) and **strictures** due to fibrosis. * **Skip Lesions:** "Numerous small bowel strictures" suggest the characteristic non-contiguous involvement. * **Right Lower Quadrant Mass:** Often represents "creeping fat," thickened bowel loops, or an inflammatory phlegmon/abscess involving the terminal ileum. **2. Why Other Options are Incorrect:** * **Adenocarcinoma:** While CD increases the risk of small bowel adenocarcinoma, it usually presents in older patients and typically as a single mass/stricture rather than multiple strictures and fistulas. * **Carcinoid Tumor:** These are the most common tumors of the appendix and ileum. While they can cause obstruction (via desmoplastic reaction), they do not typically cause fever or fistula formation. * **Pseudomembranous Colitis:** Caused by *C. difficile* toxin, it presents with profuse diarrhea and "volcano" lesions on colonoscopy. It involves the mucosa of the colon, not the small bowel, and does not cause strictures or fistulas. **3. NEET-PG High-Yield Pearls:** * **String Sign of Kantor:** Radiologic finding in CD due to terminal ileal strictures. * **Cobblestone Appearance:** Due to deep longitudinal and transverse ulcers. * **Histology:** Non-caseating granulomas (pathognomonic but seen in only ~50% of cases). * **Surgery:** Not curative; indicated only for complications (obstruction, fistula, perforation). The procedure of choice for multiple strictures is **Stricturoplasty** (to preserve bowel length).

Q: A funicular hernia is a type of:

Indirect inguinal hernia. **Explanation:** A **funicular hernia** is a specific subtype of an **indirect inguinal hernia**. The classification depends on the degree of patency of the *processus vaginalis* (the embryonic developmental pouch of the peritoneum). 1. **Why Indirect Inguinal Hernia is correct:** In an indirect hernia, the sac enters the inguinal canal through the deep inguinal ring. In the **funicular variety**, the processus vaginalis is obliterated only at its lower end, just above the epididymis. Consequently, the hernial sac is enclosed within the spermatic cord (funiculus) but does **not** communicate with the tunica vaginalis. This distinguishes it from the "complete" or "vaginal" type, where the sac extends all the way into the scrotum and surrounds the testis. 2. **Why other options are incorrect:** * **Direct Inguinal Hernia:** These occur due to a weakness in the posterior wall of the inguinal canal (Hesselbach’s triangle) and are not related to the processus vaginalis. * **Femoral Hernia:** These protrude through the femoral canal, medial to the femoral vein and below the inguinal ligament. * **Umbilical Hernia:** These occur through the umbilical scar or paraumbilical defect in the linea alba. **High-Yield Clinical Pearls for NEET-PG:** * **Types of Indirect Hernia based on Sac Extent:** 1. **Bubonocele:** Sac limited to the inguinal canal. 2. **Funicular:** Sac extends through the superficial ring but stops above the testis. 3. **Complete (Vaginal):** Sac is continuous with the tunica vaginalis; the testis lies within the lower part of the sac. * The **Internal Inguinal Ring** is the site of origin for all indirect hernias. * Indirect hernias are located **lateral** to the inferior epigastric artery, whereas direct hernias are **medial**.

Q: All statements about adult intussusception are true except?

Idiopathic and more enteric rather than colonic. **Explanation:** Intussusception in adults is a distinct clinical entity compared to the pediatric population. The correct answer is **Option A** because it is a false statement. In adults, intussusception is **rarely idiopathic** (only 10–20% of cases) and is most commonly associated with a **colonic** lead point, often a malignancy. **Breakdown of Options:** * **Option A (False):** Unlike children, where 90% of cases are idiopathic, 80–90% of adult cases have a demonstrable **pathologic lead point**. Furthermore, colonic intussusception is more common and carries a higher risk of malignancy (up to 50%) compared to enteric types. * **Option B (True):** A lead point (e.g., polyp, lipoma, or carcinoma) is present in the vast majority of adult cases, necessitating a high index of suspicion for underlying pathology. * **Option C (True):** Because of the high risk of malignancy in the large bowel, **formal oncologic resection** without prior reduction is the standard of care for adult colonic intussusception to prevent tumor seeding or perforation. * **Option D (True):** While surgery is the definitive treatment in adults, hydrostatic or pneumatic reduction is generally reserved for pediatric cases or very specific, non-obstructed adult cases where a benign etiology is certain. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** **CT Scan** is the most sensitive imaging modality, showing the classic "target" or "sausage-shaped" mass. * **Most Common Lead Point (Small Bowel):** Benign lesions (e.g., Meckel’s diverticulum, polyps). * **Most Common Lead Point (Large Bowel):** Primary adenocarcinoma. * **Management Rule:** "Reduce in children, Resect in adults." Reduction is avoided in adults if malignancy is suspected to prevent venous dissemination of malignant cells.

Q: Antral obstruction with vomiting is NOT characterised by:

Acidosis. **Explanation:** Antral obstruction (such as Gastric Outflow Obstruction or Pyloric Stenosis) leads to persistent vomiting of gastric contents. Gastric juice is rich in hydrochloric acid (HCl), potassium, and water. The resulting metabolic derangement is a classic **Paradoxical Aciduria with Hypokalemic Hypochloremic Metabolic Alkalosis**, not acidosis. **Why Acidosis is the Correct Answer (The Exception):** Vomiting results in a massive loss of Hydrogen ions ($H^+$) and Chloride ($Cl^-$). The loss of $H^+$ directly leads to **Metabolic Alkalosis**. Therefore, Acidosis is the incorrect clinical finding in this scenario. **Analysis of Incorrect Options:** * **Hypochloremia (B):** Direct loss of gastric HCl leads to low serum chloride levels. * **Hyponatremia (D):** Sodium is lost in the vomitus. Furthermore, as the body becomes dehydrated, aldosterone is secreted to retain sodium at the expense of potassium and hydrogen ions in the distal tubule. * **Hypokalemia (A):** This occurs due to three reasons: direct loss in vomitus, renal excretion to conserve $H^+$ ions, and the shift of $K^+$ into cells during alkalosis. **NEET-PG High-Yield Pearls:** 1. **Paradoxical Aciduria:** In late stages, the kidney prioritizes volume over pH. To save $Na^+$, it excretes $H^+$ (via the $Na^+/H^+$ exchange) despite the systemic alkalosis, making the urine acidic. 2. **Fluid of Choice:** The treatment of choice is **0.9% Normal Saline** (to correct volume and chloride deficit). Potassium is added once urine output is established. 3. **The "Vicious Cycle":** Hypokalemia worsens alkalosis because the kidneys are forced to excrete $H^+$ to reabsorb $K^+$.

Q: For locally invasive gastric carcinoma, what is the investigation of choice to determine the depth of cancer invasion?

EUS. **Explanation:** The correct answer is **D. EUS (Endoscopic Ultrasound)**. **Why EUS is the Investigation of Choice:** The primary challenge in staging gastric carcinoma is distinguishing between the different layers of the gastric wall (mucosa, submucosa, muscularis propria, and serosa). EUS utilizes high-frequency sound waves via an endoscope, providing high-resolution images that clearly visualize the **five-layered structure** of the gastric wall. This makes it the most accurate modality for **T-staging (depth of invasion)** and detecting perigastric lymphadenopathy (N-staging). It is particularly superior in differentiating early gastric cancer (T1) from more advanced stages (T2-T4). **Why other options are incorrect:** * **A. CECT:** While CECT is the investigation of choice for **overall staging** (detecting distant metastasis/M-staging and gross extragastric spread), it lacks the spatial resolution to accurately differentiate between the individual layers of the stomach wall. * **B. MRI:** MRI is generally reserved for patients with contrast allergies or for specific evaluation of liver metastases. It is not the primary tool for determining the depth of wall invasion. * **C. Barium Swallow:** This is a functional and luminal study. While it can detect mucosal irregularities or "linitis plastica" (leather bottle stomach), it cannot visualize the depth of mural invasion or nodal status. **High-Yield Clinical Pearls for NEET-PG:** * **T-Staging:** EUS is the gold standard. * **M-Staging:** CECT (Chest + Abdomen + Pelvis) is the gold standard. * **Linitis Plastica:** Characterized by a rigid, non-distensible stomach on barium studies and "thickened wall" on CT. * **EUS-FNA:** Allows for tissue diagnosis of suspicious perigastric lymph nodes, further refining the N-stage.

Q: A 72-year-old patient presents with esophageal carcinoma in the lower esophagus. There is no distant metastasis or lymph node involvement. What is the preferred surgical approach?

Transhiatal esophagectomy. **Explanation:** The patient has a **lower esophageal carcinoma** with no evidence of metastasis or nodal involvement (Early/Localized stage). In this scenario, **Transhiatal Esophagectomy (THE)** is a preferred approach. **Why Transhiatal Esophagectomy (A) is correct:** THE involves a blunt dissection of the esophagus through the diaphragmatic hiatus (abdominal incision) and a cervical incision for the anastomosis. It is particularly suited for **lower third tumors** because it avoids a formal thoracotomy, thereby significantly reducing pulmonary complications—a critical factor in elderly patients (72 years old). While it offers a less extensive lymphadenectomy than transthoracic routes, it is oncologically acceptable for localized lower-esophageal lesions. **Why other options are incorrect:** * **Ivor Lewis (B):** This is a transthoracic approach (Laparotomy + Right Thoracotomy). While it allows better lymph node clearance, it carries a higher risk of respiratory morbidity due to the thoracotomy. * **Endoscopic Resection (C):** This is reserved only for very early mucosal lesions (T1a). A 72-year-old presenting with symptoms usually has a more advanced stage than what can be managed endoscopically. * **McKeown (D):** This is a "three-stage" esophagectomy (Cervical + Thoracic + Abdominal). It is typically preferred for **upper or middle third** esophageal tumors to ensure adequate margins. **Clinical Pearls for NEET-PG:** * **Gold Standard for Middle Third:** Ivor Lewis esophagectomy. * **Most common complication of THE:** Recurrent laryngeal nerve palsy and anastomotic leak (though leaks in the neck are easier to manage than in the chest). * **Orringer’s Technique:** Another name for Transhiatal Esophagectomy. * **Best Conduit:** Stomach is the preferred organ for reconstruction after esophagectomy.

Q: Curling ulcer is typically seen in which of the following conditions?

Severe burns. **Explanation:** **Curling Ulcer** is a specific type of stress-induced acute gastric erosion or ulceration that occurs in patients with **severe burns** (Option A). The underlying pathophysiology involves severe hypovolemia and hemoconcentration, leading to reduced mucosal blood flow (ischemia) in the stomach. This ischemia compromises the protective mucosal barrier, allowing gastric acid to cause acute ulceration, most commonly in the fundus and body of the stomach. **Analysis of Incorrect Options:** * **Option B (Head Injury):** This is associated with **Cushing Ulcer**. Unlike Curling ulcers, Cushing ulcers are caused by increased intracranial pressure, which stimulates the vagus nerve, leading to gastric acid hypersecretion. They are more prone to perforation and can occur in the stomach, duodenum, or esophagus. * **Options C & D (Major Trauma/Surgery):** While these conditions can lead to general "stress ulcers" due to physiological stress and splanchnic hypoperfusion, they are not eponymously referred to as Curling ulcers. **Clinical Pearls for NEET-PG:** * **Mnemonic:** **C**urling – **B**urns (think: **C**url the **B**urning iron); **C**ushing – **B**rain (think: **C**ushion the **B**rain). * **Location:** Curling ulcers are typically found in the stomach (gastric), whereas Cushing ulcers can be gastric or duodenal. * **Prophylaxis:** In modern clinical practice, the incidence of these ulcers has significantly decreased due to the routine use of Proton Pump Inhibitors (PPIs), H2 blockers, and early enteral feeding in ICU settings.

Question 1

A 24-year-old man presents with symptoms of acute intestinal obstruction. His temperature is 38°C (101°F), respirations are 25 per minute, and blood pressure is 120/80 mm Hg. Physical examination reveals a mass in the right lower abdominal quadrant. Laparoscopy shows numerous small bowel strictures and a fistula extending into a loop of small bowel. Which of the following is the most likely diagnosis?

Accepted Answer

Crohn disease

Answer

Adenocarcinoma

Answer

Carcinoid tumor

Answer

Pseudomembranous colitis

Question 2

A funicular hernia is a type of:

Accepted Answer

Indirect inguinal hernia

Answer

Direct inguinal hernia

Answer

Femoral hernia

Answer

Umbilical hernia

Question 3

All statements about adult intussusception are true except?

Accepted Answer

Idiopathic and more enteric rather than colonic

Answer

Lead point is present in the majority of cases

Answer

Resection of bowel is adequate for large bowel intussusception

Answer

Hydrostatic reduction with barium or air is done if the bowel is not completely obstructed

Question 4

Which of the following is NOT a risk factor for carcinoma of the stomach?

Accepted Answer

Blood group A

Answer

Postgastrectomy state

Answer

Adenomatous polyp

Answer

Atrophic gastritis

Question 5

Antral obstruction with vomiting is NOT characterised by:

Accepted Answer

Acidosis

Answer

Hypokalemia

Answer

Hypochloremia

Answer

Hyponatremia

Question 6

For locally invasive gastric carcinoma, what is the investigation of choice to determine the depth of cancer invasion?

Accepted Answer

EUS

Answer

CECT

Answer

MRI

Answer

Barium swallow

Question 7

A 17-year-old girl presents with a history of generalized abdominal pain, fever, and recurrent vomiting. On examination, she has a temperature of 103°F, right iliac fossa tenderness, and a WBC count of 19,600/mm³.

Accepted Answer

Ruptured appendicular abscess

Answer

Torsion of ovarian cyst

Answer

Ruptured ectopic pregnancy

Answer

Intussusception

Question 8

A 45-year-old female presents with a 48-hour history of right upper quadrant pain, dyspnea, non-productive cough, fever with chills and rigor. The pain radiates to the right shoulder tip. She has a history of perforated duodenal ulcer repair 3 weeks ago. Her temperature is 39.3°C. On examination, there is acute tenderness over the right hypochondrium. A chest X-ray shows a right-sided pleural effusion. What is the most likely diagnosis?

Accepted Answer

Subphrenic abscess

Answer

Acute pancreatitis

Answer

Acute cholangitis

Answer

Pyonephrosis

Question 9

A 72-year-old patient presents with esophageal carcinoma in the lower esophagus. There is no distant metastasis or lymph node involvement. What is the preferred surgical approach?

Accepted Answer

Transhiatal esophagectomy

Answer

Ivor Lewis esophagectomy

Answer

Endoscopic resection

Answer

McKeown esophagectomy

Question 10

Curling ulcer is typically seen in which of the following conditions?

Accepted Answer

Severe burns

Answer

Head injury

Answer

Major trauma

Answer

Extensive surgical operations

Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery — MCQs

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