Gastrointestinal Surgery Practice Questions

Q: Sister Mary Joseph nodule is most commonly seen with which of the following malignancies?

Stomach cancer. ### Explanation **Sister Mary Joseph Nodule (SMJN)** refers to a palpable, firm, and often painful nodule in the umbilicus resulting from the metastasis of an intra-abdominal or pelvic malignancy. **Why Stomach Cancer is the Correct Answer:** Statistically, the most common primary site for SMJN is the **gastrointestinal tract**, and specifically, **Stomach Cancer (Gastric Adenocarcinoma)** is the most frequent cause in men and overall. The spread occurs via lymphatics, venous channels, or contiguous extension along the vestigial remnants (like the urachus or round ligament of the liver). Its presence signifies advanced, metastatic (Stage IV) disease and carries a poor prognosis. **Analysis of Incorrect Options:** * **A. Ovarian Cancer:** This is the most common cause of SMJN in **women**. While a significant cause, it ranks second to gastric cancer when considering the general population. * **C. Colon Cancer:** Though a common GI malignancy that can metastasize to the umbilicus, it is statistically less frequent than gastric primary tumors. * **D. Pancreatic Cancer:** This is a known but less common cause of SMJN compared to stomach and ovarian malignancies. **Clinical Pearls for NEET-PG:** * **Eponym:** Named after Sister Mary Joseph, the surgical assistant to Dr. William Mayo, who first noticed the correlation between umbilical nodules and intra-abdominal cancers. * **Differential Diagnosis:** Must be distinguished from an umbilical hernia or a primary umbilical tumor (e.g., melanoma). * **Other Cutaneous Signs of GI Malignancy:** * **Virchow’s Node:** Left supraclavicular lymphadenopathy. * **Irish’s Node:** Left axillary lymphadenopathy. * **Blumer’s Shelf:** Palpable mass in the pouch of Douglas (rectal shelf). * **Krukenberg Tumor:** Metastasis to the ovary (classically from the stomach).

Q: Metabolic complications of subtotal gastrectomy with Billroth I or Billroth II reconstruction include:

All of the above. Subtotal gastrectomy with Billroth I or II reconstruction significantly alters gastrointestinal anatomy and physiology, leading to several metabolic and functional complications. ### **Explanation of the Correct Answer** The correct answer is **D (All of the above)** because gastrectomy results in the loss of the stomach’s reservoir function, acid secretion, and intrinsic factor production. 1. **Anemia (Option A):** This is the most common metabolic complication. It occurs due to: * **Iron deficiency:** Loss of gastric acid (which converts ferric iron to absorbable ferrous iron) and bypass of the duodenum (primary site of iron absorption) in Billroth II. * **Vitamin B12 deficiency:** Loss of parietal cells leads to decreased **Intrinsic Factor**, causing megaloblastic anemia. 2. **Reactive Hypoglycemia (Option B):** Also known as **Late Dumping Syndrome**. Rapid gastric emptying leads to a sudden surge in blood glucose, triggering an exaggerated insulin response. This results in symptomatic hypoglycemia 1–3 hours after a meal. 3. **Dumping Syndrome (Option C):** Specifically **Early Dumping**, which occurs 20–30 minutes post-meals. High-osmolarity chyme enters the small intestine rapidly, causing fluid shifts from the intravascular space into the bowel lumen, leading to abdominal pain and vasomotor symptoms (tachycardia, syncope). ### **Clinical Pearls for NEET-PG** * **Most common anemia post-gastrectomy:** Iron deficiency anemia. * **Afferent Loop Syndrome:** Unique to Billroth II; presents as projectile non-bilious vomiting after meals. * **Bone Disease:** Osteomalacia and osteoporosis can occur due to impaired Vitamin D and Calcium absorption. * **Management of Dumping:** High-protein, low-carbohydrate, dry diets (liquids taken between meals). Octreotide is used for refractory cases.

Q: What is the most frequent mechanism leading to appendiceal perforation?

Tension gangrene due to accumulating secretions. ### Explanation The correct answer is **B. Tension gangrene due to accumulating secretions.** **Pathophysiology of Perforation:** The primary event in acute appendicitis is luminal obstruction. Once the lumen is blocked, the continuous secretion of mucus by the appendiceal mucosa leads to a rapid increase in **intraluminal pressure**. This pressure eventually exceeds the capillary perfusion pressure, leading to venous congestion and subsequent arterial compromise. The resulting ischemia causes **tension gangrene**, typically occurring at the antimesenteric border (the point of least blood supply), which ultimately leads to perforation. **Analysis of Incorrect Options:** * **A. Impacted faecolith:** While a faecolith is the most common *cause of obstruction* in adults, it is the inciting event, not the direct *mechanism* of perforation itself. Perforation is a secondary ischemic result of the obstruction. * **C. Necrosis of a lymphoid patch:** Lymphoid hyperplasia is a common cause of obstruction in children, but like the faecolith, it is a predisposing factor rather than the physiological mechanism of wall rupture. * **D. Retrocaecal appendix:** This refers to the anatomical position (the most common position, ~65%). While it may mask clinical signs (leading to a delay in diagnosis), the position itself does not cause perforation. **NEET-PG High-Yield Pearls:** * **Most common cause of obstruction:** Faecolith (Adults), Lymphoid Hyperplasia (Children). * **Sequence of symptoms (Murphy’s Triad):** Pain (periumbilical shifting to RIF), followed by vomiting, then fever. * **Perforation Risk:** Highest at the extremes of age (very young and elderly) due to delayed diagnosis or a thin appendiceal wall. * **Site of perforation:** Usually the antimesenteric border, distal to the point of obstruction.

Q: A 72-year-old man undergoes a subtotal colectomy for a cecal perforation due to a sigmoid colon obstruction. He has had a prolonged recovery and has been on total parenteral nutrition (TPN) for 2 weeks postoperatively. After regaining bowel function, he experienced significant diarrhea. Examination of his abdominal wound demonstrates minimal granulation tissue. He complains that he has lost his taste for food. He also has increased hair loss and a new perioral pustular rash. Which of the following deficiencies does he most likely have?

Zinc. **Explanation:** The clinical presentation described is a classic manifestation of **Zinc deficiency**, a common complication in patients on long-term Total Parenteral Nutrition (TPN) without adequate supplementation or those with high-output gastrointestinal losses (like diarrhea or fistulas). **Why Zinc is the correct answer:** Zinc is a vital cofactor for over 300 enzymes, including those involved in DNA synthesis and cell division. Its deficiency typically presents with: * **Dermatological signs:** Perioral and perianal pustular/eczematous rashes (Acrodermatitis enteropathica-like). * **Wound healing:** Impaired granulation tissue formation and delayed healing. * **Sensory changes:** Loss of taste (**hypogeusia**) and smell. * **Other features:** Alopecia (hair loss), diarrhea, and impaired immune function. **Why other options are incorrect:** * **Selenium:** Deficiency leads to **Keshan disease** (cardiomyopathy) and skeletal muscle dysfunction. * **Molybdenum:** Deficiency is rare but can lead to tachycardia, tachypnea, and neurological irritability due to metabolic disturbances (sulfite toxicity). * **Chromium:** Deficiency is associated with **glucose intolerance** and insulin resistance, mimicking diabetes mellitus in TPN patients. **High-Yield Clinical Pearls for NEET-PG:** * **Zinc** is primarily excreted via the GI tract; therefore, patients with high-output diarrhea or fistulas are at high risk. * **Copper deficiency** presents with microcytic anemia and neutropenia (mimicking Vitamin B12 deficiency but with low copper levels). * **Manganese toxicity** (often from TPN) can cause Parkinsonian-like symptoms (extrapyramidal signs). * **Key Triad for Zinc Deficiency:** Dermatitis (perioral), Alopecia, and Diarrhea.

Q: Lockwood repair is performed for which condition?

Femoral hernia. **Explanation:** **Lockwood’s infra-inguinal approach** is a classic surgical technique used for the repair of a **femoral hernia**. In this procedure, the incision is made directly over the femoral swelling, below and parallel to the inguinal ligament. It is primarily indicated for elective cases or when the diagnosis of a femoral hernia is certain. The repair involves reducing the hernial sac and approximating the inguinal ligament to the pectineal (Cooper’s) ligament using non-absorbable sutures to close the femoral canal. **Analysis of Incorrect Options:** * **Appendicitis:** Managed via appendectomy (e.g., McBurney’s or Lanz incision). While a femoral hernia can occasionally contain the appendix (De Garengeot hernia), Lockwood repair refers specifically to the hernia repair technique, not the treatment for primary appendicitis. * **Deep Vein Thrombosis (DVT):** This is a medical/vascular condition managed with anticoagulants or thrombolysis, not a surgical "repair" like Lockwood’s. * **Sigmoid Volvulus:** Managed via sigmoidoscopic detorsion or resection (e.g., Hartmann’s procedure), not a groin-based hernia repair. **High-Yield Clinical Pearls for NEET-PG:** * **Three Approaches to Femoral Hernia:** 1. **Lockwood:** Infra-inguinal (Low) approach. 2. **Lotheissen:** Trans-inguinal approach (through the posterior wall of the inguinal canal). 3. **McEvedy:** High/Supra-inguinal approach (vertical incision; best for strangulated hernias as it provides better exposure to the bowel). * Femoral hernias are more common in **females** and have the **highest risk of strangulation** among all hernias due to the narrow, rigid boundaries of the femoral canal.

Q: Upper GI endoscopy is indicated in all of the following conditions, except:

Corrosive ingestion: delayed phase. **Explanation:** Upper Gastrointestinal (UGI) endoscopy is a vital diagnostic and therapeutic tool, but its timing is critical, especially in cases of chemical injury. **Why Option D is the correct answer:** In **corrosive ingestion**, the timing of endoscopy is strictly defined. It is indicated within the first **12–24 hours** (early phase) to assess the severity of the injury. However, it is **strictly contraindicated in the delayed phase (5–15 days)**. During this period, the necrotic tissue sloughs off, and the esophageal wall is at its thinnest and weakest due to intense inflammation and collagen remodeling. Performing an endoscopy during this "vulnerable window" carries a high risk of **iatrogenic perforation**. **Why the other options are incorrect:** * **Peptic Ulceration:** Endoscopy is the gold standard for diagnosis, allowing for direct visualization, biopsy (to rule out malignancy or *H. pylori*), and therapeutic intervention (e.g., clipping or cauterization of bleeding vessels). * **Achalasia Cardiae:** Endoscopy is essential to rule out "pseudoachalasia" (malignancy at the GE junction) and to visualize the dilated esophagus and retained food particles. * **Barrett’s Esophagus:** Endoscopy with biopsy is mandatory for diagnosis (identifying intestinal metaplasia) and for long-term surveillance to monitor for progression to adenocarcinoma. **Clinical Pearls for NEET-PG:** * **Corrosive Injury:** The most common site of stricture is the **esophagus** (alkali) or **antrum** (acid). * **Contraindications to UGI Endoscopy:** Suspected perforation, hemodynamic instability, and the subacute/delayed phase of corrosive injury. * **Water-soluble contrast (Gastrografin)** is preferred over Barium if perforation is suspected during any stage.

Q: Phytobezoars are composed of?

Vegetable Matter. **Explanation:** A **bezoar** is a solid mass of indigestible material that accumulates in the digestive tract, most commonly in the stomach. They are classified based on their primary composition. **1. Why "Vegetable Matter" is correct:** **Phytobezoars** are the most common type of bezoar. They are composed of indigestible plant fibers such as cellulose, hemicellulose, lignin, and tannins. These are frequently found in patients with impaired gastric motility (e.g., gastroparesis) or following gastric surgeries like vagotomy or antrectomy, which reduce acid secretion and mechanical churning. A specific subtype, the *diospyrobezoar*, is formed from unripened persimmons. **2. Why the other options are incorrect:** * **A. Hair:** These are called **Trichobezoars**. They are typically seen in young females with psychiatric disorders (trichotillomania and trichophagia). A large trichobezoar extending into the small intestine is known as **Rapunzel Syndrome**. * **C. Undigested food:** While bezoars are made of food components, "Phyto-" specifically refers to plant/vegetable origin. General undigested food is too broad a term. * **D. Desquamated epithelial cells:** These are not a primary component of bezoars. However, **Lactobezoars** (composed of undigested milk curds) are seen in infants. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Stomach. * **Most common symptom:** Gastric outlet obstruction or vague abdominal pain. * **Gold Standard Diagnosis:** Upper GI Endoscopy. * **Management:** Small phytobezoars can sometimes be dissolved using **Cellulase** or **Coca-Cola lavage**. Large or obstructive masses require endoscopic removal or surgical laparotomy.

Question 1

Sister Mary Joseph nodule is most commonly seen with which of the following malignancies?

Accepted Answer

Stomach cancer

Answer

Ovarian cancer

Answer

Colon cancer

Answer

Pancreatic cancer

Question 2

Metabolic complications of subtotal gastrectomy with Billroth I or Billroth II reconstruction include:

Accepted Answer

All of the above

Answer

Anemia

Answer

Reactive hypoglycemia

Answer

Dumping syndrome

Question 3

What is the most frequent mechanism leading to appendiceal perforation?

Accepted Answer

Tension gangrene due to accumulating secretions

Answer

Impacted faecolith

Answer

Necrosis of a lymphoid patch

Answer

Retrocaecal appendix

Question 4

A 72-year-old man undergoes a subtotal colectomy for a cecal perforation due to a sigmoid colon obstruction. He has had a prolonged recovery and has been on total parenteral nutrition (TPN) for 2 weeks postoperatively. After regaining bowel function, he experienced significant diarrhea. Examination of his abdominal wound demonstrates minimal granulation tissue. He complains that he has lost his taste for food. He also has increased hair loss and a new perioral pustular rash. Which of the following deficiencies does he most likely have?

Accepted Answer

Zinc

Answer

Selenium

Answer

Molybdenum

Answer

Chromium

Question 5

Which artery is not ligated during a surgery of the cecum?

Accepted Answer

Right branch of the middle colic artery

Answer

Ileocolic artery

Answer

Right colic artery

Answer

Left colic artery

Question 6

All of the following are true about small bowel lymphoma except?

Accepted Answer

It is a very common tumour amongst small bowel malignancies.

Answer

Treatment is resection of involved segment with chemoradiotherapy.

Answer

AIDS and Celiac disease are predisposing conditions.

Answer

It may present with hemorrhage and perforation.

Question 7

Lockwood repair is performed for which condition?

Accepted Answer

Femoral hernia

Answer

Appendicitis

Answer

Deep vein thrombosis

Answer

Sigmoid volvulus

Question 8

Upper GI endoscopy is indicated in all of the following conditions, except:

Accepted Answer

Corrosive ingestion: delayed phase

Answer

Peptic ulceration

Answer

Achalasia cardiae

Answer

Barrett's esophagus

Question 9

Phytobezoars are composed of?

Accepted Answer

Vegetable Matter

Answer

Hair

Answer

Undigested food

Answer

Desquamated epithelial cells

Question 10

All are true statements about hernias EXCEPT?

Accepted Answer

An abdominal hernia needs no repair.

Answer

A femoral hernia needs repair.

Answer

A small hernia is more dangerous than a large hernia.

Answer

A painful strangulated hernia should be repaired even after being reduced after anesthetics and analgesics.

Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery — MCQs

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