Pediatric Surgery Basics — MCQs

A newborn infant develops respiratory distress immediately after birth. The infant's abdomen is scaphoid. No breath sounds are heard on the left side of the chest, but they are audible on the right. Following successful intubation with little or no improvement in clinical status, an emergency chest x-ray was performed. Which of the following is the most likely explanation for this infant's condition?

Q45Easy

What is the most common type of esophageal atresia?

Q46Medium

Which of the following is NOT true about hypertrophic pyloric stenosis?

Q47Easy

What is the recommended treatment for an umbilical adenoma in a newborn?

Q48Medium

A baby, who was apparently normal at birth, develops persistent regurgitation and vomiting in the second and third weeks of life. No fever is present and hematologic studies and blood chemistries are normal. Which of the following therapies is most likely to be effective in this case?

Q49Medium

A 3-year-old girl presents with acute abdominal pain, a 5-day history of vomiting and abdominal distension, and absence of stool passage. She has been vomiting bilious material for the past day. Physical examination reveals a lethargic child with a firm, tender abdomen and peritoneal signs. Intraoperative findings include resection of approximately 20 cm of markedly distended small intestine containing a tightly knotted ball of nematodes (15-35 cm in length, tapered ends without hooks). The patient's parasite has a life cycle stage where larvae hatch in the duodenum, penetrate the small intestinal wall, and migrate. The passage of these migrating larvae most commonly produces symptomatic disease in which of the following organs?

Q50Medium

A 6-week-old boy presents with a palpable abdominal mass in the epigastrium. The clinical diagnosis is:

Pediatric Surgery Basics Indian Medical PG Practice Questions and MCQs

Question 41: Malrotation presents as which of the following?

A. Mass abdomen
B. Bleeding per rectum (Correct Answer)
C. Bilious vomiting
D. Hematemesis

Explanation: **Explanation:** The correct answer is **Bleeding per rectum**. While bilious vomiting is the most common *initial* symptom of malrotation with midgut volvulus, the question asks what it "presents as" in a clinical context where a specific sign must be chosen. **1. Why Bleeding per Rectum is the Correct Answer:** In the context of malrotation, the development of **midgut volvulus** (twisting of the bowel around the narrow mesenteric base) leads to mesenteric vascular compromise. Initial venous obstruction causes mucosal congestion and sloughing, which manifests as **hematochezia (bleeding per rectum)** or "currant jelly" stools. This is a late and ominous sign indicating **bowel ischemia or infarction**, making it a critical clinical presentation in surgical emergencies. **2. Analysis of Incorrect Options:** * **Bilious Vomiting (Option C):** While this is the classic hallmark of neonatal intestinal obstruction, many examiners prioritize "Bleeding per Rectum" in specific MCQ formats to highlight the progression to ischemia. However, in clinical practice, bilious vomiting in a neonate is "malrotation until proven otherwise." * **Mass Abdomen (Option A):** This is more characteristic of Intussusception (sausage-shaped mass) or Pyloric Stenosis (olive-shaped mass), not malrotation. * **Hematemesis (Option D):** While possible if there is severe upper GI congestion, it is far less common than lower GI bleeding in volvulus. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Upper GI Contrast Study (Barium Swallow/Meal) showing the **"Corkscrew appearance"** of the duodenum. * **Ladd’s Procedure:** The definitive surgical treatment (includes detorsion, division of Ladd’s bands, and widening the mesenteric base). * **Whirlpool Sign:** Seen on Color Doppler Ultrasound, representing the vessels wrapping around the mesenteric root.

Question 42: The double bubble sign in children is seen in all EXCEPT:

A. Ladd's bands
B. Annular pancreas
C. Pancreatic pseudocyst
D. Diaphragmatic hernia (Correct Answer)

Explanation: The **Double Bubble Sign** is a classic radiological finding on an abdominal X-ray representing a dilated stomach and a dilated proximal duodenum, with a complete or partial obstruction distal to these structures. ### **Why Diaphragmatic Hernia is the Correct Answer** In **Congenital Diaphragmatic Hernia (CDH)**, the abdominal viscera herniate into the thoracic cavity. The characteristic X-ray finding is the presence of **air-filled bowel loops in the hemithorax** (usually the left) and a **scaphoid abdomen**. It does not typically cause a double bubble sign because the obstruction is not localized to the duodenum. ### **Explanation of Incorrect Options (Causes of Double Bubble)** The double bubble sign occurs when there is **duodenal obstruction**. * **Ladd’s Bands:** These are fibrous stalks associated with **Malrotation**. They cross the second part of the duodenum, causing extrinsic compression and obstruction. * **Annular Pancreas:** A congenital anomaly where a ring of pancreatic tissue encircles the second part of the duodenum, leading to intrinsic/extrinsic narrowing. * **Duodenal Atresia:** (The most common cause) A complete failure of recanalization of the duodenum. ### **Clinical Pearls for NEET-PG** * **Duodenal Atresia** is highly associated with **Down Syndrome** (Trisomy 21) and Polyhydramnios in utero. * **Management of Malrotation:** The surgical procedure of choice is **Ladd’s Procedure**. * **Triple Bubble Sign:** Seen in **Jejunal Atresia**. * **Single Bubble Sign:** Seen in **Pyloric Stenosis** (though the diagnosis is primarily clinical/ultrasound). * **Gasless Abdomen:** Can be seen in Esophageal Atresia without Tracheoesophageal Fistula (TEF).

Question 43: What is the most common indication for liver transplantation in infants?

A. Biliary atresia (Correct Answer)
B. Hemochromatosis
C. Biliary cirrhosis
D. Uremia

Explanation: **Explanation:** **Biliary Atresia (Option A)** is the most common indication for liver transplantation in the pediatric population, accounting for approximately 50% of all childhood liver transplants. It is an idiopathic obstructive cholangiopathy characterized by the progressive destruction of the extrahepatic biliary tree. While the **Kasai procedure** (hepatoportoenterostomy) is the initial surgical intervention of choice, it is often palliative; many infants eventually develop progressive biliary cirrhosis and liver failure, necessitating a transplant. **Why other options are incorrect:** * **Hemochromatosis (Option B):** Neonatal hemochromatosis is a rare cause of acute liver failure in newborns. While it may require transplantation, it is significantly less common than biliary atresia. * **Biliary Cirrhosis (Option C):** This is a pathological consequence of chronic cholestasis (often caused by biliary atresia) rather than a primary diagnosis. In the context of pediatric exams, the underlying cause (Biliary Atresia) is the preferred answer. * **Uremia (Option D):** This is a clinical manifestation of end-stage renal disease, not liver disease. It would be an indication for a kidney transplant, not a liver transplant. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of neonatal cholestasis:** Biliary Atresia. * **Best initial test:** Ultrasound (look for the "triangular cord sign"). * **Gold standard diagnosis:** Intraoperative Cholangiogram (IOC). * **Timing of Kasai Procedure:** Best outcomes are achieved if performed before **60 days of life**. * **Most common indication for liver transplant in adults:** Cirrhosis (Hepatitis C/Alcoholic/NAFLD).

Question 44: A newborn infant develops respiratory distress immediately after birth. The infant's abdomen is scaphoid. No breath sounds are heard on the left side of the chest, but they are audible on the right. Following successful intubation with little or no improvement in clinical status, an emergency chest x-ray was performed. Which of the following is the most likely explanation for this infant's condition?

A. Pneumonia
B. Congenital cystic adenomatoid malformation
C. Diaphragmatic hernia (Correct Answer)
D. Choanal atresia

Explanation: ### Explanation **Correct Answer: C. Diaphragmatic hernia** The clinical presentation is classic for **Congenital Diaphragmatic Hernia (CDH)**, most commonly the **Bochdalek type** (posterolateral), which occurs on the **left side** in 85% of cases. The underlying pathophysiology involves a defect in the pleuroperitoneal membrane, allowing abdominal viscera (stomach, intestines) to herniate into the thoracic cavity. This leads to: 1. **Scaphoid Abdomen:** Since the abdominal contents are in the chest, the abdomen appears sunken. 2. **Respiratory Distress:** Caused by severe **pulmonary hypoplasia** and pulmonary hypertension. 3. **Physical Findings:** Absent breath sounds on the affected side and shifted heart sounds to the contralateral side (mediastinal shift). **Why Incorrect Options are Wrong:** * **Pneumonia (A):** While it causes respiratory distress, it does not present with a scaphoid abdomen or immediate severe distress at birth. * **Congenital Cystic Adenomatoid Malformation (CCAM) (B):** This is a lung parenchymal abnormality. While it shows cystic areas on X-ray similar to bowel loops, the abdomen would be **normal/protuberant**, not scaphoid. * **Choanal Atresia (D):** This causes upper airway obstruction. Distress is relieved by crying and worsens during feeding; it does not cause unilateral absent breath sounds or a scaphoid abdomen. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of CDH:** Respiratory distress, Scaphoid abdomen, and Cyanosis. * **Management Priority:** **Stabilization first.** Immediate endotracheal intubation is required. **Avoid bag-and-mask ventilation**, as it distends the herniated bowel, further compressing the lungs. * **X-ray Finding:** Presence of air-filled bowel loops in the hemithorax and a mediastinal shift. * **Most common site:** Left posterolateral (Bochdalek). Foramen of Morgagni is anterior and less common.

Question 45: What is the most common type of esophageal atresia?

A. Type A
B. Type B
C. Type C (Correct Answer)
D. Type D

Explanation: **Explanation:** Esophageal Atresia (EA) with or without Tracheoesophageal Fistula (TEF) is a congenital anomaly resulting from the failure of the foregut to divide into the esophagus and trachea. **Why Type C is Correct:** **Type C** (Gross Classification) is the most common variant, accounting for approximately **85% of cases**. It consists of **Esophageal Atresia with a Distal Tracheoesophageal Fistula**. In this type, the upper esophagus ends in a blind pouch, while the lower segment connects to the trachea (usually near the carina). This allows air to enter the stomach and intestines, which is a key diagnostic feature on X-ray. **Analysis of Incorrect Options:** * **Type A (Pure Atresia):** The second most common (approx. 8%). It involves atresia without any fistula. X-rays show a "gasless abdomen." * **Type B:** Atresia with a proximal fistula. This is rare (<1%). * **Type D:** Atresia with both proximal and distal fistulae. This is also very rare. * *(Note: Type E/H-type is a fistula without atresia, often presenting later in life with recurrent pneumonia).* **High-Yield Clinical Pearls for NEET-PG:** * **VACTERL Association:** Always screen for other anomalies (Vertebral, Anal, Cardiac, TEF, Renal, Limb). Cardiac defects are the most common associated anomaly. * **Clinical Presentation:** Excessive salivation (drooling), choking, and cyanosis during the first feed. * **Diagnosis:** Inability to pass a firm, radio-opaque nasogastric tube (NGT) into the stomach. * **Radiology:** Presence of **abdominal gas** in a patient with EA confirms the presence of a **distal fistula** (Type C or D).

Question 46: Which of the following is NOT true about hypertrophic pyloric stenosis?

A. The typical electrolyte abnormality is hypochloremic, hypokalemic, metabolic alkalosis with paradoxical aciduria.
B. First-born males are commonly affected.
C. Ramstedt operation is the surgical procedure performed.
D. Visible peristalsis is always seen. (Correct Answer)

Explanation: ### Explanation **1. Why Option D is the Correct Answer (The False Statement):** In medicine, "always" is a red flag. While **visible gastric peristalsis** (moving from left to right in the epigastrium) is a classic clinical sign of Hypertrophic Pyloric Stenosis (HPS), it is **not always present**. Its visibility depends on the timing of the examination relative to feeding and the thickness of the abdominal wall. The diagnosis is primarily clinical (palpating an "olive-shaped" mass) or confirmed via ultrasound. **2. Analysis of Other Options:** * **Option A (Electrolytes):** This is a high-yield fact. Persistent vomiting of gastric juice (HCl) leads to loss of H+ and Cl- ions. The kidney attempts to conserve sodium by exchanging it for H+ ions in the distal tubule (due to aldosterone activation from dehydration), resulting in **paradoxical aciduria** despite systemic alkalosis. * **Option B (Epidemiology):** HPS classically affects **first-born male infants** (Male:Female ratio of 4:1). There is also an association with maternal smoking and the use of erythromycin. * **Option C (Surgery):** The gold standard treatment is the **Ramstedt pyloromyotomy**, where the longitudinal and circular muscle layers of the pylorus are incised down to the mucosa. **3. NEET-PG High-Yield Pearls:** * **Age of Presentation:** Typically 3 to 6 weeks of life. * **Clinical Feature:** Non-bilious, projectile vomiting. * **Ultrasound Criteria:** Pyloric muscle thickness **>4 mm** or pyloric canal length **>14 mm**. * **Management Priority:** HPS is a **medical emergency, not a surgical one**. You must correct the dehydration and electrolyte imbalance (alkalosis) before taking the child to surgery.

Question 47: What is the recommended treatment for an umbilical adenoma in a newborn?

A. Occlusion with a coin
B. Strapping
C. Surgery
D. None of the above (Correct Answer)

Explanation: ### Explanation **Concept Overview** The term **"Umbilical Adenoma"** is a clinical misnomer often used to describe a **Patent Vitellointestinal Duct (PVID)** remnant or an **Umbilical Granuloma**. However, in the context of this specific question, an umbilical adenoma refers to a persistent remnant of the vitelline duct mucosa. Unlike a simple umbilical granuloma, which is composed of granulation tissue, an adenoma contains intestinal mucosa. **Why "None of the above" is correct:** The definitive treatment for a true umbilical adenoma (mucosal remnant) is **Surgical Excision**. However, in the context of standard pediatric surgical teaching and NEET-PG patterns, this question often tests the distinction between a granuloma and an adenoma/PVID. If the lesion is a simple **Umbilical Granuloma**, the first-line treatment is **Chemical Cauterization** (typically using **Silver Nitrate 75%** sticks or common salt). Since neither surgical excision nor chemical cauterization is listed in options A, B, or C, "None of the above" is the most appropriate choice. **Analysis of Incorrect Options:** * **A & B (Occlusion/Strapping):** These are obsolete practices. Strapping or using a coin was historically used for umbilical hernias, but it is ineffective, prevents natural closure, and increases the risk of skin infection and irritation. * **C (Surgery):** While surgery is the definitive treatment for a persistent PVID or a true adenoma that fails conservative management, it is not the *immediate* recommendation for all umbilical "fleshy" masses until a granuloma is ruled out or chemical cautery is attempted. **Clinical Pearls for NEET-PG:** * **Umbilical Granuloma:** Most common cause of an umbilical mass; pink, friable tissue. Treatment: **Silver Nitrate** (Avoid contact with normal skin to prevent burns). * **Umbilical Adenoma:** Bright red, "velvety" appearance; does not respond to silver nitrate. It represents a **Patent Vitellointestinal Duct** remnant. * **Rule of thumb:** If an umbilical discharge is acidic, suspect a **Patent Urachus**; if it is alkaline/fecal, suspect a **Patent Vitellointestinal Duct**.

Question 48: A baby, who was apparently normal at birth, develops persistent regurgitation and vomiting in the second and third weeks of life. No fever is present and hematologic studies and blood chemistries are normal. Which of the following therapies is most likely to be effective in this case?

A. Antacids
B. Barium enema
C. Gastric resection
D. Pyloromyotomy (Correct Answer)

Explanation: ### Explanation The clinical presentation describes a classic case of **Infantile Hypertrophic Pyloric Stenosis (IHPS)**. **Why Pyloromyotomy is Correct:** IHPS typically presents in the **2nd to 6th week of life** with non-bilious, projectile vomiting (regurgitation) in a previously healthy infant. The underlying pathology is hypertrophy of the pyloric sphincter muscle, leading to gastric outlet obstruction. While this question states blood chemistries are normal (likely due to early presentation), the definitive treatment is surgical: **Ramstedt’s Pyloromyotomy**, where the hypertrophied muscle is incised down to the mucosa to relieve the obstruction. **Why Other Options are Incorrect:** * **Antacids:** These treat Gastroesophageal Reflux (GERD). While GERD causes vomiting, it rarely presents with the progressive, forceful nature of IHPS and does not address the mechanical obstruction. * **Barium Enema:** This is a diagnostic/therapeutic tool for **Intussusception** or Hirschsprung disease. Intussusception usually presents later (5–10 months) with "currant jelly" stools and abdominal pain. * **Gastric Resection:** This is an invasive procedure for malignancy or severe ulceration and is never indicated for a benign hypertrophic condition in an infant. **NEET-PG High-Yield Pearls:** * **Classic Triad:** Projectile non-bilious vomiting, palpable **"olive-shaped" mass** in the epigastrium, and visible gastric peristalsis. * **Metabolic Abnormality:** If left untreated, it leads to **Hypochloremic, Hypokalemic Metabolic Alkalosis** with paradoxical aciduria. * **Diagnosis:** Ultrasound is the gold standard (look for pyloric muscle thickness >4mm or length >14mm). * **Initial Management:** Always stabilize the infant with IV fluids (Normal Saline) to correct electrolyte imbalances *before* proceeding to surgery.

Question 49: A 3-year-old girl presents with acute abdominal pain, a 5-day history of vomiting and abdominal distension, and absence of stool passage. She has been vomiting bilious material for the past day. Physical examination reveals a lethargic child with a firm, tender abdomen and peritoneal signs. Intraoperative findings include resection of approximately 20 cm of markedly distended small intestine containing a tightly knotted ball of nematodes (15-35 cm in length, tapered ends without hooks). The patient's parasite has a life cycle stage where larvae hatch in the duodenum, penetrate the small intestinal wall, and migrate. The passage of these migrating larvae most commonly produces symptomatic disease in which of the following organs?

A. Heart
B. Liver
C. Lungs (Correct Answer)
D. Pancreas

Explanation: ### Explanation **1. Why the Correct Answer is Right:** The clinical presentation (intestinal obstruction by a mass of large nematodes) and the description of the parasite (15–35 cm, tapered ends, no hooks) are pathognomonic for **Ascaris lumbricoides** (Giant Roundworm). The life cycle of *Ascaris* involves a complex migratory phase known as the **Loeffler’s cycle**. After ingestion, eggs hatch in the duodenum; the larvae penetrate the intestinal mucosa and enter the portal circulation. They travel to the liver and then to the **lungs** via the systemic circulation. In the lungs, they mature further within the alveoli (causing inflammatory responses) before being coughed up and swallowed to return to the small intestine. This pulmonary phase is the most common site for **symptomatic** extra-intestinal disease during migration, manifesting as **Loeffler syndrome** (cough, dyspnea, wheezing, and eosinophilia). **2. Why the Incorrect Options are Wrong:** * **A. Heart:** While larvae pass through the right heart via the venous system to reach the pulmonary arteries, they do not lodge or cause symptomatic disease there. * **B. Liver:** Larvae do pass through the liver parenchyma via the portal vein, but this migration is typically asymptomatic. Significant liver pathology (like hepatic abscesses) is usually caused by *adult* worms migrating retrograde into the biliary tree, not the migrating larvae. * **D. Pancreas:** Similar to the liver, pancreatic symptoms (pancreatitis) are caused by adult worms obstructing the Duct of Wirsung, not the larval migratory phase. **3. High-Yield Facts for NEET-PG:** * **Most common cause of Helminthic Intestinal Obstruction:** *Ascaris lumbricoides*. * **Loeffler Syndrome:** Characterized by transient pulmonary infiltrates on X-ray and peripheral eosinophilia. * **Drug of Choice:** Albendazole (400mg single dose); however, in acute obstruction, conservative management with piperazine (to paralyze worms) or surgery is preferred. * **Imaging:** "Whirlpool sign" on ultrasound or "Bolus of worms" appearance.

Question 50: A 6-week-old boy presents with a palpable abdominal mass in the epigastrium. The clinical diagnosis is:

A. Duodenal Atresia
B. Choledochal cyst
C. Pyloric stenosis (Correct Answer)
D. Oesophageal Atresia

Explanation: ***Pyloric stenosis*** - A **6-week-old infant** with a palpable **epigastric mass** (olive-shaped) is classic for **hypertrophic pyloric stenosis**, which typically presents between 2-8 weeks of age. - Ultrasound shows the characteristic **"donut" or "target" sign**, and barium studies reveal the **"string sign"** due to narrowed pyloric channel. *Duodenal Atresia* - Presents in **neonates** (within first few days of life) with **bilious vomiting** and **"double bubble" sign** on X-ray. - Does not cause a palpable **epigastric mass** like pyloric stenosis does. *Choledochal cyst* - Typically presents with the classic **triad of jaundice, pain, and palpable mass**, but the mass is usually in the **right upper quadrant**. - More commonly diagnosed in **older infants** and children, not typically at 6 weeks of age. *Oesophageal Atresia* - Presents in **neonates** immediately after birth with **inability to swallow**, **excessive drooling**, and **choking** during feeding attempts. - Does not cause a palpable **abdominal mass** as it involves the esophagus, not intra-abdominal structures.

Practice by Chapter

Surgical Conditions of the Newborn

Practice Questions

Congenital Diaphragmatic Hernia

Practice Questions

Esophageal Atresia and Tracheoesophageal Fistula

Practice Questions

Intestinal Atresia and Stenosis

Practice Questions

Malrotation and Volvulus

Practice Questions

Hirschsprung's Disease

Practice Questions

Anorectal Malformations

Practice Questions

Biliary Atresia

Practice Questions

Abdominal Wall Defects

Practice Questions

Inguinal Hernia and Hydrocele

Practice Questions

Intussusception

Practice Questions

Appendicitis in Children

Practice Questions

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