Pediatric Surgery Practice Questions

Q: A newborn infant presents with a history of multiple episodes of bilious projectile vomiting. An X-ray of the abdomen was performed. What is the most likely diagnosis?

Jejunal atresia. ***Jejunal atresia*** - **Bilious projectile vomiting** in a newborn with X-ray showing **triple-bubble sign** or **dilated proximal small bowel loops** with **absent distal gas** is characteristic of jejunal atresia. - The obstruction occurs in the **proximal jejunum**, leading to dilation of the stomach, duodenum, and proximal jejunal segment. *Duodenal atresia* - Typically presents with **double-bubble sign** on X-ray, showing dilated stomach and duodenum only. - While it causes **bilious vomiting**, the X-ray pattern differs from the **multiple dilated loops** seen in jejunal atresia. *Ileal atresia* - Characterized by **multiple dilated small bowel loops** throughout the abdomen on X-ray, not the specific triple-bubble pattern. - Occurs more **distally** in the small intestine, allowing more bowel segments to dilate before the obstruction. *Hypertrophic pyloric stenosis* - Presents with **non-bilious projectile vomiting** as the obstruction is **proximal to the ampulla of Vater**. - Diagnosis is typically made by **ultrasound** showing thickened pyloric muscle, not by abdominal X-ray findings.

Q: Which of the following statements is NOT true regarding pyloric stenosis?

Alkaline urine. In Infantile Hypertrophic Pyloric Stenosis (IHPS), the hallmark is non-bilious projectile vomiting, leading to a specific electrolyte derangement: **Hypochloremic Hypokalemic Metabolic Alkalosis with Paradoxical Aciduria.** ### Why "Alkaline Urine" is the Correct Answer (The False Statement) Initially, the kidney attempts to compensate for metabolic alkalosis by excreting bicarbonate ($HCO_3^-$) along with sodium. However, as vomiting continues, the body becomes volume-depleted. To conserve volume, the kidney activates the Renin-Angiotensin-Aldosterone System (RAAS). Aldosterone acts on the distal tubule to reabsorb Sodium ($Na^+$) at the expense of Hydrogen ($H^+$) and Potassium ($K^+$) ions. Despite the systemic alkalosis, the kidney excretes $H^+$ ions to save sodium, resulting in **acidic urine** (Paradoxical Aciduria). Therefore, "Alkaline urine" is incorrect. ### Analysis of Other Options * **C. Metabolic Alkalosis:** Loss of gastric hydrochloric acid ($HCl$) directly increases serum bicarbonate levels. * **D. Hypochloremia:** Direct loss of chloride ions in the vomitus. * **A. Hypokalemia:** Occurs due to both direct loss in vomitus and, more significantly, renal exchange where $K^+$ is excreted to conserve $Na^+$ under the influence of aldosterone. ### High-Yield Pearls for NEET-PG * **Diagnosis:** Best initial test is **Ultrasound** (Pyloric thickness >4mm, length >14mm). * **Clinical Sign:** "Olive-shaped" mass felt in the epigastrium. * **Radiology:** "String sign" or "Beak sign" on Barium swallow. * **Management:** Never a surgical emergency. **Resuscitate first** with Normal Saline (0.9%) + Potassium. Surgery (Ramstedt’s Myotomy) is performed only after correcting electrolytes.

Q: What is the most common presentation of Meckel's diverticulum?

Lower GI bleeding. **Explanation:** Meckel’s diverticulum is the most common congenital anomaly of the gastrointestinal tract, resulting from the failure of the **vitellointestinal duct** to obliterate. **Why Lower GI Bleeding is Correct:** The most common clinical presentation, especially in the pediatric population, is **painless lower gastrointestinal bleeding**. This occurs because approximately 50% of symptomatic Meckel’s diverticula contain **ectopic gastric mucosa**. This ectopic tissue secretes acid, leading to ulceration of the adjacent ileal mucosa (which lacks protective mechanisms against acid). The resulting hemorrhage typically presents as "currant jelly" or brick-red stools. **Why Other Options are Incorrect:** * **Upper GI Bleeding:** Meckel’s diverticulum is located in the distal ileum (lower GI tract); therefore, bleeding manifests as hematochezia or melena, not hematemesis. * **Diarrhea:** This is not a classic feature of Meckel’s. While inflammatory processes (Meckel’s diverticulitis) may cause altered bowel habits, it is not the primary presentation. * **Abdominal Pain:** While pain occurs in cases of diverticulitis or intussusception (where the diverticulum acts as a lead point), **painless** bleeding remains the most frequent presentation overall. **High-Yield Clinical Pearls for NEET-PG:** * **The Rule of 2s:** 2% of the population, 2 inches long, 2 feet from the ileocecal valve, 2 types of ectopic tissue (Gastric > Pancreatic), and presents before age 2. * **Investigation of Choice:** **Technetium-99m pertechnetate scan** (Meckel’s scan), which identifies the ectopic gastric mucosa. * **Complications:** In adults, intestinal obstruction is more common, whereas, in children, bleeding is the most common symptom. * **Littre’s Hernia:** When a Meckel’s diverticulum is present within a hernial sac.

Q: Which of the following is the treatment of choice for Stage I Wilm's Tumor?

Open nephroureterectomy. **Explanation:** The treatment of choice for **Stage I Wilms’ Tumor (Nephroblastoma)** is a radical **Open Nephroureterectomy**. **1. Why Open Nephroureterectomy is correct:** In pediatric oncology, the primary goal is complete surgical excision without tumor spillage. An open approach (usually via a wide transperitoneal incision) allows for: * **Thorough Exploration:** Inspection of the contralateral kidney to rule out synchronous tumors. * **Safe Handling:** Minimizing the risk of capsular rupture, which would upstage the tumor to Stage III and necessitate abdominal radiation. * **Lymph Node Sampling:** Essential for accurate pathological staging. **2. Why other options are incorrect:** * **Laparoscopic Nephroureterectomy:** While common in adults, it is generally avoided in Wilms’ tumor due to the high risk of **tumor seeding and spillage** during morcellation or manipulation, which worsens the prognosis. * **Chemotherapy:** While Wilms' is highly chemosensitive (using Vincristine and Dactinomycin), in the **NWTS (National Wilms Tumor Study)** protocol followed in the US, surgery is the *initial* step for Stage I. (Note: The SIOP protocol in Europe uses pre-operative chemo, but surgery remains the definitive treatment). * **Observation:** Wilms’ tumor is a malignant neoplasm; observation is never an option. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of metastasis:** Lungs (Cannon-ball metastasis). * **Staging:** Stage I is limited to the kidney and is **completely excised** with an intact capsule. * **WAGR Syndrome:** Wilms tumor, Aniridia, Genitourinary anomalies, and mental Retardation (associated with WT1 gene deletion on Chromosome 11p13). * **Prognosis:** Wilms’ tumor has an excellent prognosis, with cure rates exceeding 90% for localized disease.

Q: Which of the following is NOT true about congenital hypertrophic pyloric stenosis (CHPS)?

Ultrasound (USG) is not useful in diagnosis.. ### Explanation: Congenital Hypertrophic Pyloric Stenosis (CHPS) **Why Option D is the Correct Answer:** Ultrasound (USG) is actually the **gold standard** and investigation of choice for diagnosing CHPS. It is highly sensitive (95-100%) and specific. Diagnostic criteria on USG include a **pyloric muscle thickness >3 mm** and a **pyloric canal length >14 mm**. Therefore, stating that USG is "not useful" is factually incorrect. **Analysis of Other Options:** * **Option A (Males commonly affected):** This is true. CHPS shows a strong male predilection, with a male-to-female ratio of **4:1**. It is particularly common in first-born male infants. * **Option B (Presents between 3-8 weeks):** This is true. While symptoms can start as early as 2 weeks, the classic presentation of non-bilious, projectile vomiting occurs between **3 to 6 weeks** of life. * **Option C (X-ray findings):** This is true. A plain abdominal X-ray typically shows a **distended stomach gas shadow** (gastric dilation) with a "caterpillar sign" (hyperperistaltic waves) and a relative **paucity of gas** in the distal small intestines due to the gastric outlet obstruction. **High-Yield Clinical Pearls for NEET-PG:** * **Metabolic Abnormality:** The classic triad is **Hypochloremic, Hypokalemic, Metabolic Alkalosis** with paradoxical aciduria. * **Physical Exam:** A palpable, firm, mobile, ovoid mass in the epigastrium known as the **"Olive-shaped mass"** is pathognomonic. * **Barium Swallow Signs:** If USG is inconclusive, barium studies may show the **"String sign"** (narrowed pyloric canal) or **"Beak sign."** * **Management:** The definitive surgical treatment is **Ramstedt’s Pyloromyotomy**. However, the immediate priority is always the correction of dehydration and electrolyte imbalances.

Q: Which of the following is a true congenital hernia through the foramen of Bochdalek?

Congenital hernia. **Explanation:** The **Bochdalek hernia** is the most common type of congenital diaphragmatic hernia (CDH), occurring due to the failure of the **pleuroperitoneal membrane** to fuse with the septum transversum and dorsal mesentery of the esophagus during the 8th–10th week of gestation. **Why Option A is Correct:** It is a **true congenital hernia** because it results from a developmental defect present at birth. It occurs through the posterolateral foramen (Foramen of Bochdalek), most commonly on the **left side (80-90%)** because the left pleuroperitoneal canal closes later than the right, and the liver provides a protective barrier on the right side. **Analysis of Incorrect Options:** * **Option B (Is asymptomatic):** Incorrect. It is rarely asymptomatic. It typically presents in the neonatal period with severe **respiratory distress**, cyanosis, and a scaphoid abdomen due to pulmonary hypoplasia and displacement of abdominal viscera into the thorax. * **Option C (Seen especially in males):** Incorrect. There is no significant male predilection; it affects both sexes relatively equally, though some studies suggest a very slight male predominance, it is not a defining characteristic. * **Option D (Least common):** Incorrect. Bochdalek hernia is the **most common** type of CDH (approx. 95%), whereas Morgagni hernia (retrosternal/anterior) is the least common (approx. 2-5%). **NEET-PG High-Yield Pearls:** * **Triad of CDH:** Dyspnea, Cyanosis, and Scaphoid abdomen. * **Most common cause of death:** Pulmonary hypoplasia and persistent pulmonary hypertension. * **Radiology:** Chest X-ray shows gas-filled loops of bowel in the hemithorax and a mediastinal shift to the opposite side. * **Management:** It is a **medical, not surgical, emergency**. Initial stabilization (intubation, avoid bag-mask ventilation to prevent bowel distension) is crucial before surgical repair.

Q: In pyloric stenosis, the following changes are seen?

Hypokalemic hyponatremic alkalosis. ### Explanation In **Infantile Hypertrophic Pyloric Stenosis (IHPS)**, the hallmark metabolic derangement is **Hypokalemic, Hypochloremic, Hyponatremic Metabolic Alkalosis with Paradoxical Aciduria**. **Why Option A is Correct:** 1. **Vomiting:** Persistent non-bilious vomiting leads to the loss of gastric juice rich in **Hydrogen (H+)**, **Chloride (Cl-)**, and **Water**. 2. **Alkalosis:** The loss of H+ ions directly causes metabolic alkalosis. 3. **Hyponatremia & Hypochloremia:** Loss of NaCl in vomitus and subsequent volume depletion leads to low sodium and chloride levels. 4. **Hypokalemia:** This occurs due to two reasons: * Direct loss of Potassium (K+) in vomitus. * **Renal Compensation:** To conserve volume, the kidneys activate the Renin-Angiotensin-Aldosterone System (RAAS). Aldosterone reabsorbs Na+ at the expense of excreting K+ and H+ into the urine. **Why Other Options are Incorrect:** * **B & D (Hyperkalemia/Hyperchloremic Acidosis):** These are seen in conditions like Renal Tubular Acidosis or Addison’s disease. In pyloric stenosis, Cl- and K+ are always lost, never elevated. * **C (Acidosis):** Vomiting gastric acid (HCl) inherently leads to a rise in pH (alkalosis), not a drop (acidosis). **High-Yield Clinical Pearls for NEET-PG:** * **Paradoxical Aciduria:** Initially, the kidney excretes bicarbonate (alkaline urine). As dehydration worsens, the kidney prioritizes Na+ reabsorption. To save Na+, it secretes H+ ions into the urine, making the urine **acidic** despite systemic **alkalosis**. * **Fluid of Choice:** Normal Saline (0.9% NaCl) with added Potassium. **Never** use Ringer’s Lactate as the liver converts lactate to bicarbonate, worsening the alkalosis. * **Diagnosis:** Ultrasound is the gold standard (Muscle thickness >4mm, Length >14mm). Look for the "Target sign" or "Donut sign."

Q: What is the commonest cause of intestinal obstruction in a newborn?

Duodenal atresia. **Explanation:** **Duodenal atresia** is the most common cause of congenital intestinal obstruction in newborns. It results from a failure of recanalization of the duodenum during the 8th to 10th week of gestation. Clinically, it presents shortly after birth with **bilious vomiting** (as the obstruction is usually distal to the ampulla of Vater) and epigastric distension. The classic radiographic finding is the **"Double Bubble Sign,"** representing air in the stomach and the proximal duodenum. **Analysis of Options:** * **Annular Pancreas (A):** While it is a common cause of duodenal obstruction, it is less frequent than atresia. It occurs due to the failure of the ventral pancreatic bud to rotate properly, encircling the second part of the duodenum. * **Jejunal Atresia (C):** This is caused by an in-utero **vascular accident** (ischemic necrosis) rather than a recanalization failure. While common, its incidence is lower than that of duodenal atresia. * **Oesophageal Atresia (D):** This presents with drooling, choking, and cyanosis during feeding, but it is an esophageal anomaly, not an *intestinal* obstruction. **High-Yield Clinical Pearls for NEET-PG:** * **Association:** Approximately 30% of infants with duodenal atresia have **Down Syndrome (Trisomy 21)**. * **Antenatal finding:** Maternal **polyhydramnios** is frequently noted due to the fetus's inability to swallow and absorb amniotic fluid. * **Management:** The surgical treatment of choice is **Duodenoduodenostomy** (Diamond-shaped anastomosis). * **Vomiting Rule:** Obstruction proximal to the ampulla of Vater (rare) results in non-bilious vomiting; distal obstruction (common) results in bilious vomiting.

Q: According to Moore's classification of omphalocole (examphalos), type I umbilical defect is less than what size in cm?

2.5. **Explanation:** Moore’s classification is a clinical grading system used to categorize the severity of an omphalocele (examphalos) based on the diameter of the umbilical defect. This classification is crucial for determining the surgical approach and predicting the risk of associated anomalies. * **Correct Answer (B):** According to Moore’s classification, a **Type I defect** (also known as a small omphalocele or omphalocele of the cord) is defined as having an umbilical defect diameter of **less than 2.5 cm**. These are typically small hernias into the base of the umbilical cord and often contain only loops of the small intestine. * **Incorrect Options (A, C, D):** These values do not align with the standardized Moore’s criteria. A **Type II defect** (Giant Omphalocele) is defined as a defect **greater than 2.5 cm** in diameter. These larger defects often contain the liver and have a higher association with pulmonary hypoplasia and chromosomal abnormalities. **High-Yield Clinical Pearls for NEET-PG:** * **Omphalocele vs. Gastroschisis:** Omphalocele is a midline defect covered by a sac (amnion and peritoneum), whereas gastroschisis is usually to the right of the umbilicus and has no sac. * **Associated Anomalies:** Omphalocele is highly associated with other malformations (up to 50-70%), most notably **Beckwith-Wiedemann Syndrome** (macroglossia, gigantism, hypoglycemia) and **Pentalogy of Cantrell**. * **Management:** Type I defects can often be closed primarily. Type II (Giant) defects may require staged closure using a Silastic silo (Schuster’s procedure) to prevent abdominal compartment syndrome.

Q: A 55-day-old infant born prematurely at 27 weeks of gestation presents with a non-tender, firm swelling that is not hot or red. The swelling does not transilluminate and appears to resolve with pressure but returns when the infant cries or strains. What is the most appropriate course of action?

Obtain a surgical consultation.. ### Explanation The clinical presentation is classic for an **Inguinal Hernia**. In a premature infant, the patent processus vaginalis fails to close, allowing abdominal contents (usually bowel or omentum) to protrude into the inguinal canal. **Why Option A is Correct:** Unlike umbilical hernias, which often resolve spontaneously, **inguinal hernias in infants never resolve on their own** and carry a high risk of incarceration and strangulation, especially in preterm neonates. The standard of care is **surgical repair (inguinal herniotomy)**. Because the infant is currently asymptomatic (non-tender, reducible), an urgent surgical consultation is the most appropriate next step to plan for elective or semi-urgent repair before discharge from the NICU. **Why Other Options are Incorrect:** * **B. Needle aspiration:** This is contraindicated. If the swelling contains a loop of bowel, aspiration would cause perforation and peritonitis. * **C & D. Barium enema/KUB:** These are not indicated for a simple reducible hernia. Imaging is only required if there are signs of intestinal obstruction (vomiting, abdominal distension) or if the diagnosis is clinically ambiguous. **Clinical Pearls for NEET-PG:** * **Incidence:** Inguinal hernias are significantly more common in **preterm infants** (up to 30%) compared to term infants (3-5%). * **Side:** More common on the **right side** (due to later descent of the right testis). * **Physical Exam:** The "Silk Glove Sign" (feeling the layers of the hernia sac rubbing against each other) is a pathognomonic finding. * **Management Rule:** Umbilical hernias are managed conservatively (most close by age 2-4 years); Inguinal hernias are always managed surgically.

Question 1

A newborn infant presents with a history of multiple episodes of bilious projectile vomiting. An X-ray of the abdomen was performed. What is the most likely diagnosis?

Accepted Answer

Jejunal atresia

Answer

Duodenal atresia

Answer

Ileal atresia

Answer

Hypertrophic pyloric stenosis

Question 2

Which of the following statements is NOT true regarding pyloric stenosis?

Accepted Answer

Alkaline urine

Answer

Hypokalemia

Answer

Metabolic alkalosis

Answer

Hypochloremia

Question 3

What is the most common presentation of Meckel's diverticulum?

Accepted Answer

Lower GI bleeding

Answer

Upper GI bleeding

Answer

Diarrhea

Answer

Abdominal pain

Question 4

Which of the following is the treatment of choice for Stage I Wilm's Tumor?

Accepted Answer

Open nephroureterectomy

Answer

Laparoscopic nephroureterectomy

Answer

Chemotherapy

Answer

Observation

Question 5

Which of the following is NOT true about congenital hypertrophic pyloric stenosis (CHPS)?

Accepted Answer

Ultrasound (USG) is not useful in diagnosis.

Answer

Males are commonly affected.

Answer

It commonly presents between 3-8 weeks of age.

Answer

X-ray may show gastric dilation and gasless small intestines.

Question 6

Which of the following is a true congenital hernia through the foramen of Bochdalek?

Accepted Answer

Congenital hernia

Answer

Is asymptomatic

Answer

Seen especially in males

Answer

Least common

Question 7

In pyloric stenosis, the following changes are seen?

Accepted Answer

Hypokalemic hyponatremic alkalosis

Answer

Hyperkalemia

Answer

Acidosis with hyponatremic alkalosis

Answer

Hyperchloremic acidosis

Question 8

What is the commonest cause of intestinal obstruction in a newborn?

Accepted Answer

Duodenal atresia

Answer

Annular pancreas

Answer

Jejunal atresia

Answer

Oesophageal atresia

Question 9

According to Moore's classification of omphalocole (examphalos), type I umbilical defect is less than what size in cm?

Accepted Answer

2.5

Answer

0.5

Answer

3.5

Answer

4.5

Question 10

A 55-day-old infant born prematurely at 27 weeks of gestation presents with a non-tender, firm swelling that is not hot or red. The swelling does not transilluminate and appears to resolve with pressure but returns when the infant cries or strains. What is the most appropriate course of action?

Accepted Answer

Obtain a surgical consultation.

Answer

Perform a needle aspiration.

Answer

Order a barium enema.

Answer

Order KUB radiographs.

Pediatric Surgery — MCQs

Pediatric Surgery — MCQs

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