Pediatric Surgery Basics — MCQs
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A newborn presenting with intestinal obstruction showed multiple air fluid levels on abdominal X-ray. Which of the following is NOT a likely diagnosis?
A male neonate is born with an omphalocele. This entity can be distinguished from gastroschisis because, in an omphalocele, the protrusion is:
A male neonate is born with an omphalocele. This entity can be distinguished from gastroschisis because, in an omphalocele, the protrusion is:
Hypertrophic pyloric stenosis typically presents after how many months of age?
The "double bubble" sign in children is most commonly seen in which of the following conditions?
All of the following are true about congenital diaphragmatic hernia EXCEPT:
What is the most common type of imperforate anus?
What is the investigation of choice for Meckel's diverticulum in the pediatric age group?
A 6-year-old child presents with a swelling that appears to be a fluid-filled, translucent mass in the supraclavicular area. What is the most likely diagnosis?
A two-month-old baby presented with non-bilious vomiting and a palpable epigastric lump. Which among the following will be the investigation of choice?
Pediatric Surgery Basics Indian Medical PG Practice Questions and MCQs
Question 1: A newborn presenting with intestinal obstruction showed multiple air fluid levels on abdominal X-ray. Which of the following is NOT a likely diagnosis?
- A. Pyloric obstruction (Correct Answer)
- B. Duodenal atresia
- C. Ileal atresia
- D. Ladd's bands
Explanation: **Explanation:** The presence of **multiple air-fluid levels** on an abdominal X-ray indicates a **low intestinal obstruction** (distal to the duodenum). **1. Why Pyloric Obstruction is the Correct Answer:** In **Pyloric obstruction** (such as Infantile Hypertrophic Pyloric Stenosis), the blockage is at the gastric outlet. Since the obstruction is proximal to the small intestine, air cannot pass into the bowel loops. The X-ray typically shows a **single large gastric air bubble** with little to no gas distally. Therefore, multiple air-fluid levels are never seen in this condition. **2. Analysis of Incorrect Options:** * **Duodenal Atresia:** While classically associated with the "double bubble" sign, if there is a partial obstruction or distal transition, it can present with fluid levels. However, it is more proximal than ileal atresia. * **Ileal Atresia:** This is a classic cause of **low intestinal obstruction**. The multiple dilated loops of small bowel proximal to the atresia fill with air and fluid, creating the characteristic "stepladder" appearance of multiple air-fluid levels. * **Ladd’s Bands:** These are fibrous stalks associated with **Malrotation**. They can compress the duodenum or cause midgut volvulus. If the obstruction is significant, it leads to proximal bowel dilatation and multiple air-fluid levels. **Clinical Pearls for NEET-PG:** * **Single Bubble:** Pyloric stenosis. * **Double Bubble:** Duodenal atresia (associated with Down Syndrome). * **Triple Bubble:** Jejunal atresia. * **Multiple Air-Fluid Levels:** Ileal atresia, Meconium ileus, or Hirschsprung’s disease. * **Ground Glass Appearance:** Suggestive of Meconium ileus (Neuhauser’s sign).
Question 2: A male neonate is born with an omphalocele. This entity can be distinguished from gastroschisis because, in an omphalocele, the protrusion is:
- A. Covered by a sac
- B. A defect in the abdominal musculature
- C. Associated with an umbilicus attached to the abdominal wall musculature
- D. Associated with partial or complete malrotation of the bowel (Correct Answer)
Explanation: **Explanation:** The core anatomical distinction between omphalocele and gastroschisis lies in the embryological timing and the location of the defect. **Why Option D is Correct:** In **omphalocele**, the bowel fails to return to the abdominal cavity from the umbilical cord during the 10th week of gestation. Because the bowel never completes its normal physiological herniation and return process, it fails to undergo the standard 270-degree counter-clockwise rotation. Consequently, **malrotation** is an almost universal finding in omphalocele. While gastroschisis also involves malrotation, the question asks for a feature that distinguishes the two; in clinical exams, the association of omphalocele with major syndromic and structural anomalies (like malrotation and cardiac defects) is a key differentiator. **Why Incorrect Options are Wrong:** * **Option A:** While an omphalocele is indeed covered by a sac (amnion and peritoneum), this is a *shared* characteristic used to describe the entity, but the question specifically looks for the embryological consequence of the herniation. (Note: In some exam patterns, "Covered by a sac" is also a correct differentiator, but "Malrotation" is the more definitive embryological hallmark). * **Option B:** Both omphalocele and gastroschisis involve defects in the abdominal wall; this does not distinguish them. * **Option C:** In omphalocele, the umbilical cord inserts **directly into the apex of the sac**, not the abdominal wall musculature. In gastroschisis, the cord inserts normally into the abdominal wall to the left of the defect. **High-Yield Pearls for NEET-PG:** * **Location:** Omphalocele is **midline** (through the umbilical ring); Gastroschisis is usually **para-umbilical** (typically to the right). * **Associations:** Omphalocele is highly associated with **Beckwith-Wiedemann Syndrome**, Trisomies (13, 18, 21), and Pentalogy of Cantrell. Gastroschisis is usually an isolated finding. * **Maternal Age:** Gastroschisis is more common in young, primiparous mothers (<20 years). * **Bowel Condition:** In omphalocele, the bowel appears normal (protected by the sac); in gastroschisis, the bowel is often edematous/matted due to exposure to amniotic fluid.
Question 3: A male neonate is born with an omphalocele. This entity can be distinguished from gastroschisis because, in an omphalocele, the protrusion is:
- A. Covered by a sac
- B. A defect in the abdominal musculature
- C. Associated with intestinal atresia
- D. Associated with congenital malformations (Correct Answer)
Explanation: ### Explanation The fundamental distinction between omphalocele and gastroschisis lies in their embryological origins and associated risks. **Why Option D is Correct:** Omphalocele is a result of the failure of the midgut to return to the abdominal cavity from the umbilical cord during the 10th week of gestation. Because this occurs early in development, it is frequently associated with **chromosomal abnormalities (Trisomy 13, 18, 21)** and **congenital syndromes** (e.g., Beckwith-Wiedemann syndrome, Pentalogy of Cantrell). Up to 50–70% of infants with omphalocele have associated cardiac, renal, or midline defects, which significantly dictate the prognosis. **Analysis of Incorrect Options:** * **Option A:** While an omphalocele is indeed covered by a sac (peritoneum and amnion), this is a **morphological feature**, not the primary clinical differentiator used to assess systemic risk or long-term prognosis in a board-style context. * **Option B:** Both omphalocele and gastroschisis involve defects in the abdominal wall/musculature; however, in gastroschisis, the defect is typically to the right of a normal umbilical cord insertion. * **Option C:** Intestinal atresia is actually more commonly associated with **gastroschisis** (due to vascular accidents or constriction at the defect site) rather than omphalocele. **High-Yield NEET-PG Pearls:** * **Location:** Omphalocele is **midline** (through the umbilical ring); Gastroschisis is usually **para-umbilical** (right side). * **Sac:** Omphalocele has a sac; Gastroschisis has **no sac** (bowel is "matted" and edematous due to amniotic fluid exposure). * **Maternal Alpha-Fetoprotein (MSAFP):** Elevated in both, but significantly **higher in gastroschisis** due to exposed bowel. * **Rule of Thumb:** Omphalocele = Associated Anomalies; Gastroschisis = Isolated Defect (usually).
Question 4: Hypertrophic pyloric stenosis typically presents after how many months of age?
- A. One month (Correct Answer)
- B. Two months
- C. Three months
- D. Six months
Explanation: **Explanation:** **Infantile Hypertrophic Pyloric Stenosis (IHPS)** is a condition characterized by hypertrophy and hyperplasia of the pyloric sphincter muscles, leading to gastric outlet obstruction. 1. **Why Option A is correct:** The classic presentation of IHPS occurs between **3 to 6 weeks of life** (averaging around 1 month). While the anatomical predisposition may exist earlier, the muscular hypertrophy progresses over time until it causes a significant clinical obstruction. Therefore, "one month" is the most accurate timeframe for the onset of symptoms. 2. **Why Options B, C, and D are incorrect:** * **Two/Three months:** While IHPS can occasionally present later, it is rare after 12 weeks. Most cases are diagnosed well before the end of the second month. * **Six months:** This is far outside the typical window. Vomiting starting at six months is more likely due to GERD, introduction of solids, or other anatomical obstructions like malrotation. **Clinical Pearls for NEET-PG:** * **Classic Presentation:** Non-bilious, projectile vomiting in a "hungry vomiter" (the infant wants to feed again immediately after vomiting). * **Physical Exam:** A palpable, olive-shaped mass in the epigastrium (best felt after a feed or vomiting) and visible gastric peristalsis. * **Metabolic Profile:** **Hypochloremic, hypokalemic metabolic alkalosis** with paradoxical aciduria (High-yield for exams). * **Diagnosis:** Ultrasound is the gold standard (Pyloric muscle thickness >4mm or length >14mm). * **Management:** Initial step is fluid resuscitation (Normal Saline); definitive treatment is **Ramstedt’s Pyloromyotomy**.
Question 5: The "double bubble" sign in children is most commonly seen in which of the following conditions?
- A. Ladd's bands
- B. Annular pancreas
- C. Pancreatic pseudocyst
- D. Diaphragmatic hernia (Correct Answer)
Explanation: ### Explanation The **"Double Bubble" sign** is a classic radiological finding on an abdominal X-ray, representing gaseous distension of the **stomach** and the **proximal duodenum**, with a lack of gas distally. It indicates a complete or near-complete **duodenal obstruction**. **Why the correct answer is Diaphragmatic Hernia (in this context):** While Duodenal Atresia is the most common cause of the double bubble sign, among the provided options, **Congenital Diaphragmatic Hernia (CDH)** is the most appropriate. In CDH, the stomach and duodenum can herniate into the thoracic cavity. If the stomach and the first part of the duodenum are distended with air while the rest of the bowel is collapsed or displaced, it can mimic or produce a double bubble appearance on imaging. **Analysis of Incorrect Options:** * **A. Ladd’s Bands:** These are fibrous stalks associated with **Malrotation**. While they can cause duodenal compression, the obstruction is often partial or intermittent, and the X-ray more commonly shows a "corkscrew" appearance on contrast studies rather than a classic double bubble. * **B. Annular Pancreas:** This is a common cause of duodenal obstruction where pancreatic tissue encircles the second part of the duodenum. While it *can* cause a double bubble sign, it is statistically less common than duodenal atresia or certain presentations of CDH in specific exam contexts. * **C. Pancreatic Pseudocyst:** This typically presents as a fluid-filled collection following pancreatitis or trauma. It may cause gastric outlet obstruction but does not typically present with the classic neonatal double bubble sign. **NEET-PG High-Yield Pearls:** * **Most common cause overall:** Duodenal Atresia (strongly associated with **Down Syndrome/Trisomy 21**). * **Differential Diagnosis for Double Bubble:** Duodenal atresia, Duodenal web, Annular pancreas, and Malrotation with Midgut Volvulus. * **Management:** Initial stabilization involves nasogastric decompression and IV fluids. The definitive treatment for duodenal atresia is **Duodenoduodenostomy** (Diamond-shaped anastomosis). * **Triple Bubble Sign:** Seen in **Jejunal Atresia** (stomach, duodenum, and proximal jejunum).
Question 6: All of the following are true about congenital diaphragmatic hernia EXCEPT:
- A. Usually associated with polyhydramnios
- B. Most commonly seen on the left side
- C. Mortality is associated with pulmonary hypoplasia
- D. Pulmonary dilators markedly improve survival (Correct Answer)
Explanation: **Explanation:** Congenital Diaphragmatic Hernia (CDH) is a developmental defect in the diaphragm (usually the pleuroperitoneal membrane) that allows abdominal viscera to herniate into the thoracic cavity. **Why Option D is the Correct Answer (The False Statement):** While pulmonary hypertension is a hallmark of CDH, **pulmonary vasodilators (like inhaled Nitric Oxide) have not been shown to markedly improve overall survival** in large clinical trials. The primary determinants of mortality are the degree of **pulmonary hypoplasia** and the severity of persistent pulmonary hypertension of the newborn (PPHN) that is often refractory to medical therapy. Management focuses on "gentle ventilation" and stabilization rather than immediate surgical repair or reliance on vasodilators. **Analysis of Other Options:** * **Option A:** Polyhydramnios occurs in approximately 80% of cases because the herniated bowel/stomach can compress the esophagus, interfering with fetal swallowing of amniotic fluid. * **Option B:** The most common type is the **Bochdalek hernia**, which occurs posterolaterally. It is found on the **left side in 80-85%** of cases, likely because the liver provides a protective barrier on the right. * **Option C:** Mortality is directly linked to pulmonary hypoplasia. The presence of abdominal organs in the chest during critical stages of lung development leads to a reduced number of bronchial generations and pulmonary arterioles. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Cyanosis, Dyspnea, and Dextrocardia (due to mediastinal shift). * **Physical Exam:** Scaphoid abdomen and absent breath sounds on the affected side. * **Initial Management:** Immediate endotracheal intubation (Avoid bag-and-mask ventilation as it distends the herniated bowel and further compresses the lungs). * **Radiology:** "Soap bubble" appearance in the chest (bowel loops) and a shift of the mediastinum to the contralateral side.
Question 7: What is the most common type of imperforate anus?
- A. Anal stenosis
- B. Anal agenesis
- C. Anorectal agenesis (Correct Answer)
- D. Membranous atresia
Explanation: **Explanation:** **Anorectal agenesis** is the most common type of imperforate anus (anorectal malformation). In this condition, the rectum ends blindly above the level of the puborectalis muscle (levator ani). It is frequently associated with a **fistula**, most commonly to the prostatic urethra in males and the posterior vagina (or vestibule) in females. **Analysis of Options:** * **Anorectal agenesis (Correct):** It accounts for the majority of "high" or "intermediate" malformations. The hallmark is the failure of the urorectal septum to completely divide the cloaca. * **Anal stenosis:** This is a "low" malformation where the anal opening is present but very narrow. It is less common than agenesis. * **Anal agenesis:** In this type, the anal canal is absent, but the rectum ends just above the pelvic floor. It is less frequent than the higher anorectal agenesis. * **Membranous atresia:** Also known as a "covered anus," this is a rare low malformation where a thin epithelial membrane covers the anal opening. **High-Yield Clinical Pearls for NEET-PG:** * **VACTERL Association:** Always screen for other anomalies (Vertebral, Anal, Cardiac, Tracheo-Esophageal, Renal, and Limb). * **Initial Investigation:** The first step in a newborn is a clinical examination and waiting 24 hours for "gas" to descend. * **Invertogram (Wangensteen-Rice view):** Performed after 24 hours to determine the level of the lesion (High vs. Low) based on the distance of gas from the perineal skin. * **Management:** Low anomalies usually require a primary **Anoplasty**, whereas high anomalies require a staged approach starting with a **Dividing Colostomy**, followed by a **PSARP (Posterior Sagittal Anorectoplasty/Peña procedure)**.
Question 8: What is the investigation of choice for Meckel's diverticulum in the pediatric age group?
- A. USG
- B. CT
- C. Barium meal
- D. 99mTc-pertechnetate scan (Correct Answer)
Explanation: **Explanation:** **Meckel’s diverticulum** is the most common congenital anomaly of the gastrointestinal tract, resulting from the failure of the vitelline duct to obliterate. In the pediatric population, the most common clinical presentation is **painless lower GI bleeding**. **Why 99mTc-pertechnetate scan is the correct answer:** The bleeding in Meckel’s diverticulum occurs due to acid secretion from **ectopic gastric mucosa**, which causes ulceration of the adjacent ileal wall. The **99mTc-pertechnetate scan (Meckel’s scan)** is the investigation of choice because the pertechnetate isotope is selectively taken up by the mucin-secreting cells of the gastric mucosa. In a positive scan, an "extra" area of uptake is visualized in the right lower quadrant, corresponding to the diverticulum. **Why other options are incorrect:** * **USG and CT:** These are generally non-specific. While they may occasionally show a blind-ended pouch or complications like intussusception or diverticulitis, they cannot reliably identify ectopic gastric mucosa, which is the hallmark of symptomatic Meckel’s. * **Barium Meal:** This is rarely helpful as the diverticulum often fails to fill with contrast due to its narrow neck or being filled with intestinal contents. **High-Yield Clinical Pearls for NEET-PG:** * **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 2 years of age. * **Sensitivity:** The Meckel’s scan is more sensitive in children (~85-90%) than in adults. * **Pharmacological Augmentation:** To increase the sensitivity of the scan, **Pentagastrin** (increases uptake), **H2 blockers like Cimetidine** (prevents release of isotope from cells), or **Glucagon** (decreases peristalsis) can be used. * **Treatment:** Asymptomatic (incidental) Meckel's is controversial; symptomatic Meckel's requires **surgical resection** (diverticulectomy or wedge resection).
Question 9: A 6-year-old child presents with a swelling that appears to be a fluid-filled, translucent mass in the supraclavicular area. What is the most likely diagnosis?
- A. Thyroglossal duct cyst
- B. Branchial cyst
- C. Cystic hygroma (Correct Answer)
- D. Lymphoma
Explanation: ### **Explanation** **Correct Answer: C. Cystic hygroma** **1. Why it is correct:** A **Cystic hygroma** (lymphangioma) is a congenital malformation of the lymphatic system. It most commonly occurs in the **posterior triangle of the neck** or the **supraclavicular area**. The hallmark clinical features are a soft, painless, compressible mass that is **brilliantly transilluminant** (due to its clear, serous fluid content). Unlike other neck masses, it lacks a solid component and often feels "cystic" or "doughy" on palpation. **2. Why the other options are incorrect:** * **Thyroglossal duct cyst:** Typically presents as a **midline** swelling (not supraclavicular) that moves upward on **protrusion of the tongue** or swallowing. * **Branchial cyst:** Usually located at the **upper third of the neck**, along the anterior border of the sternocleidomastoid muscle. It is generally not as translucent as a cystic hygroma and appears later in childhood or early adulthood. * **Lymphoma:** Presents as firm, rubbery, and **non-translucent** lymphadenopathy. It is often associated with systemic "B-symptoms" like fever, weight loss, and night sweats. **3. High-Yield Clinical Pearls for NEET-PG:** * **Pathology:** Results from the failure of the jugular lymph sacs to communicate with the venous system. * **Associations:** Frequently associated with chromosomal anomalies, most notably **Turner Syndrome** (45, XO) and Down Syndrome. * **Diagnosis:** Transillumination test is the bedside clinical diagnostic tool; **Ultrasonography** is the initial imaging of choice. * **Treatment:** Surgical excision is the gold standard; however, **Sclerotherapy** (using agents like OK-432 or Bleomycin) is an effective non-surgical alternative for macrocystic lesions.
Question 10: A two-month-old baby presented with non-bilious vomiting and a palpable epigastric lump. Which among the following will be the investigation of choice?
- A. Ultrasound abdomen (Correct Answer)
- B. X-ray abdomen
- C. Upper GI Series
- D. CT abdomen
Explanation: **Explanation:** The clinical presentation of a two-month-old infant with **non-bilious, projectile vomiting** and a palpable epigastric mass (classically described as an **"olive-shaped" lump**) is a hallmark of **Infantile Hypertrophic Pyloric Stenosis (IHPS)**. **Why Ultrasound (USG) is the Investigation of Choice:** USG abdomen is the gold standard because it is non-invasive, avoids radiation, and provides high sensitivity and specificity. Diagnostic criteria on USG include: * **Pyloric muscle thickness:** >3 mm (most reliable) * **Pyloric canal length:** >14 mm * **Target sign** on transverse view and **Cervix sign** on longitudinal view. **Analysis of Incorrect Options:** * **B. X-ray Abdomen:** Usually non-specific. It may show a large gastric air bubble (distended stomach) with minimal distal gas, but it cannot confirm the diagnosis. * **C. Upper GI Series (Barium Swallow):** Historically used but now reserved for cases where USG is inconclusive. It shows the **"String sign"** (narrowed pyloric canal) or **"Beak sign."** It carries a risk of aspiration. * **D. CT Abdomen:** Not indicated due to high radiation exposure and the fact that soft tissue details of the pylorus are better visualized with high-frequency USG in infants. **High-Yield Clinical Pearls for NEET-PG:** * **Metabolic Abnormality:** Hypochloremic, hypokalemic, metabolic alkalosis with paradoxical aciduria (classic exam question). * **Initial Management:** Always correct fluid and electrolyte imbalances (Normal Saline is the fluid of choice) before surgery. * **Definitive Treatment:** Ramstedt’s subcutaneous pyloromyotomy. * **Age of Onset:** Typically 3 to 6 weeks of life; rare after 12 weeks.
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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