Pediatric Surgery — MCQs

Pediatric Surgery Indian Medical PG Practice Questions and MCQs

Question 171: What is the most common site for Morgagni's hernia?

A. Left anterior
B. Right posterior
C. Right anterior (Correct Answer)
D. Left posterior

Explanation: **Explanation:** Congenital Diaphragmatic Hernias (CDH) occur due to the failure of fusion of the pleuroperitoneal membranes. **Morgagni’s hernia** is a rare type of CDH (accounting for ~2-5% of cases) that occurs through the **Foramen of Morgagni**. This is an anterior defect located between the sternal and costal attachments of the diaphragm. **Why Right Anterior is correct:** The Foramen of Morgagni is a bilateral potential space. However, the **right anterior** side is the most common site (approx. 90% of cases). This is because the left side is anatomically protected by the **pericardial attachments** and the heart, which act as a physical barrier against herniation. **Analysis of Incorrect Options:** * **Left anterior:** While the defect can be bilateral or left-sided, it is much rarer due to the protective presence of the heart. * **Left posterior:** This is the classic site for a **Bochdalek hernia**, which is the most common type of CDH overall (occurring through the pleuroperitoneal canal). * **Right posterior:** This is an uncommon site for Bochdalek hernias; they are predominantly left-sided (80-85%). **High-Yield Clinical Pearls for NEET-PG:** * **Bochdalek Hernia:** Most common CDH; usually presents in the neonatal period with respiratory distress; most common on the **Left Posterior** side. * **Morgagni Hernia:** Usually presents later in life (often asymptomatic or with vague GI symptoms); most common on the **Right Anterior** side. * **Radiology:** Morgagni hernia typically presents as a mass in the **right cardiophrenic angle** on a chest X-ray. * **Association:** Frequently associated with Down syndrome and obesity.

Question 172: A 15-year-old child presents with acute abdominal pain and a history of blood and mucous in the stool. A mass is palpable on physical examination. What is the MOST probable diagnosis?

A. Meckel's diverticulum
B. Volvulus
C. Intussusception (Correct Answer)
D. Hypertrophic pyloric stenosis

Explanation: **Explanation:** **Correct Option: C. Intussusception** Intussusception is the most common cause of intestinal obstruction in children between 6 months and 3 years of age. The classic clinical triad consists of **intermittent colicky abdominal pain**, a **palpable "sausage-shaped" mass** (usually in the right upper quadrant), and the passage of **"red currant jelly" stools** (blood and mucus). The condition occurs when a proximal segment of the bowel (intussusceptum) telescopes into a distal segment (intussuscipiens). In older children (like the 15-year-old in this vignette), a pathological lead point such as Meckel’s diverticulum or lymphoma should be strongly suspected. **Why Incorrect Options are Wrong:** * **A. Meckel’s Diverticulum:** While it can cause painless profuse rectal bleeding (hematochezia), it typically does not present with a palpable mass unless it leads to intussusception or diverticulitis. * **B. Volvulus:** Midgut volvulus usually presents in the neonatal period with acute bilious vomiting and abdominal distension. While it is a surgical emergency, a discrete palpable mass is not a characteristic finding. * **C. Hypertrophic Pyloric Stenosis (HPS):** HPS typically presents in infants (3–6 weeks old) with non-bilious, projectile vomiting and an "olive-shaped" mass in the epigastrium. It does not cause bloody stools. **NEET-PG High-Yield Pearls:** * **Target/Donut Sign:** The classic appearance on Ultrasonography (investigation of choice). * **Dance’s Sign:** Emptiness in the Right Iliac Fossa (RIF) due to the migration of the cecum. * **Management:** Non-operative reduction using **Air/Hydrostatic Enema** is the first-line treatment if there are no signs of peritonitis or perforation. * **Lead Points:** In adults and older children, 90% of cases have a demonstrable lead point (e.g., polyp, Meckel’s, or malignancy).

Question 173: At what age is cleft palate ideally repaired?

A. 5 months of age
B. 1 year of age (Correct Answer)
C. Before going to school
D. 6-8 years of age

Explanation: The timing of cleft palate repair is a critical balance between facilitating normal speech development and ensuring adequate maxillofacial growth. ### **Explanation of the Correct Answer** **Option B (1 year of age)** is the ideal time for repair. The primary goal of palatoplasty is to create a functional velopharyngeal mechanism to allow for **normal speech development**. Speech patterns begin to solidify around 12–18 months; therefore, repairing the palate by **9–12 months** ensures the child has the anatomical structure necessary to produce articulate sounds before they start forming words. ### **Analysis of Incorrect Options** * **Option A (5 months):** This is too early. While cleft lip is typically repaired at 3–6 months (Rule of 10s), repairing the palate this early can severely restrict the growth of the maxilla, leading to midface hypoplasia and dental malocclusion. * **Option C (Before school):** Waiting until age 4–5 is too late. By this time, the child will have developed "cleft palate speech" (compensatory articulations and hypernasality), which is difficult to correct even with intensive speech therapy. * **Option D (6-8 years):** At this age, the speech defect is permanent, and the psychological impact of the deformity is significant. Surgery at this stage is usually reserved for secondary revisions or bone grafting. ### **High-Yield Clinical Pearls for NEET-PG** * **Cleft Lip Repair:** Ideally done at **3 months** (Follows Millard’s Rule of 10: 10 weeks old, 10 lbs weight, 10g hemoglobin). * **Cleft Palate Repair:** Ideally **9–12 months** (Must be completed before speech onset). * **Common Surgical Techniques:** * *Veau-Wardill-Kilner* (V-Y pushback) * *Bardach’s* Two-flap palatoplasty * *Furlow’s* Double opposing Z-plasty (lengthens the soft palate). * **Complication:** The most common complication after palatoplasty is **fistula formation** or **Otitis Media with Effusion** (due to Eustachian tube dysfunction involving the *tensor veli palatini* muscle).

Question 174: What is the recommended management for a cystic hygroma?

A. Observation without intervention
B. Surgical excision in early childhood (Correct Answer)
C. Expectation of spontaneous regression
D. Typical manifestation in the second to third decade of life

Explanation: **Explanation:** **Cystic Hygroma** (Cystic Lymphangioma) is a congenital malformation of the lymphatic system, most commonly occurring in the posterior triangle of the neck (75%). **Why Option B is Correct:** The definitive treatment for cystic hygroma is **complete surgical excision**, ideally performed in early childhood (usually after 6 months to 2 years of age, or earlier if symptomatic). Early intervention is preferred because these lesions tend to grow progressively, infiltrating tissue planes and vital structures (nerves and vessels), making later dissection technically difficult and increasing the risk of recurrence. **Why Other Options are Incorrect:** * **Options A & C:** Spontaneous regression is extremely rare (less than 5%). Observation is generally not recommended because the lesion can become infected, bleed internally, or cause sudden airway compromise due to rapid enlargement. * **Option D:** Cystic hygromas are typically present at birth (60%) or manifest by age two (90%). Presentation in the second or third decade is highly unusual. **High-Yield NEET-PG Pearls:** * **Clinical Feature:** It is a soft, painless, compressible, and **brilliantly transilluminant** mass. It is "cross-fluctuant" as it often spans across the sternocleidomastoid muscle. * **Complications:** Sudden increase in size may occur due to hemorrhage or upper respiratory tract infection, potentially leading to **stridor** or dysphagia. * **Alternative Treatment:** For macrocystic lesions where surgery is risky, **Sclerotherapy** (using agents like OK-432/Picibanil or Bleomycin) is an effective alternative. * **Association:** Often associated with chromosomal anomalies like **Turner syndrome** and Down syndrome.

Question 175: What is the treatment of choice for fibrous dysplasia of the mandible in a 7-year-old girl?

A. Wait and watch (Correct Answer)
B. Symmetrical resection of the mandible
C. Hemi mandibulectomy
D. Local irradiation

Explanation: **Explanation:** **Fibrous Dysplasia (FD)** is a benign fibro-osseous lesion where normal bone is replaced by weak, fibrous connective tissue. In the pediatric population, particularly when involving the mandible, the management strategy is primarily conservative. **1. Why "Wait and Watch" is correct:** In a 7-year-old child, the facial skeleton is still actively growing. Fibrous dysplasia often follows a self-limiting course, frequently stabilizing or even regressing after puberty when skeletal maturity is reached. Surgical intervention in a growing child is avoided because: * It can interfere with growth centers, leading to secondary facial deformities. * The margins of FD are poorly defined, making complete resection difficult. * Conservative management (observation) is preferred unless there is significant functional impairment (breathing/swallowing) or severe progressive deformity. **2. Why other options are incorrect:** * **Symmetrical resection/Hemi-mandibulectomy:** These are overly aggressive and mutilating procedures for a benign, often self-limiting condition in a child. Radical surgery is reserved only for rare, rapidly expanding lesions that cause functional loss. * **Local irradiation:** This is **strictly contraindicated**. Radiation therapy for fibrous dysplasia carries a high risk of inducing malignant transformation into **Osteosarcoma** or Fibrosarcoma. **Clinical Pearls for NEET-PG:** * **Radiological Hallmark:** "Ground-glass" opacification with ill-defined borders (blending into normal bone). * **McCune-Albright Syndrome:** Triad of Polyostotic FD, Café-au-lait spots (Coast of Maine borders), and Precocious puberty. * **Monostotic vs. Polyostotic:** Monostotic (single bone) is the most common form (70-80%). * **Surgical Rule:** If surgery is required for aesthetics, it is ideally delayed until after puberty ("Surgical contouring").

Question 176: Regression of midgut herniation during embryogenesis occurs at:

A. 6 weeks
B. 10 weeks (Correct Answer)
C. 16 weeks
D. 20 weeks

Explanation: **Explanation:** The development of the midgut is a dynamic process characterized by rapid growth and rotation. During the **6th week** of intrauterine life, the midgut undergoes **physiological herniation** into the umbilical cord because the abdominal cavity is too small to accommodate the rapidly enlarging liver and kidneys. **Why 10 weeks is correct:** By the **10th week**, the abdominal cavity has enlarged sufficiently, and the growth of the liver slows down. This allows the herniated midgut loops to return (regress) to the abdominal cavity. During this return, the midgut completes a total rotation of **270° counter-clockwise** around the axis of the superior mesenteric artery. **Analysis of Incorrect Options:** * **6 weeks:** This is the timing of the **onset** of physiological herniation, not its regression. * **16 & 20 weeks:** By this stage, the midgut is already well-settled in the abdomen, and fixation of the mesentery to the posterior abdominal wall is underway. **High-Yield Clinical Pearls for NEET-PG:** * **Sequence:** Herniation (6th week) → Rotation (starts in the cord) → Return/Regression (10th week) → Fixation (occurs post-return). * **Omphalocele:** Occurs when the midgut **fails to return** to the abdomen by the 10th-12th week; the bowel remains covered by a sac of peritoneum and amnion. * **Gastroschisis:** A full-thickness defect in the abdominal wall (usually to the right of the umbilicus) where bowel protrudes **without** a covering sac. * **Malrotation:** Results from an arrest in the normal 270° rotation process, often leading to **Ladd’s bands** and midgut volvulus.

Question 177: Gasless abdomen is a feature of which of the following conditions?

A. High intestinal obstruction
B. Acute pancreatitis
C. Congenital diaphragmatic hernia
D. All of the above (Correct Answer)

Explanation: **Explanation:** A **"Gasless Abdomen"** on an X-ray refers to the absence or marked deficiency of normal bowel gas patterns. This occurs when air cannot reach the distal intestines or when the abdominal cavity is relatively empty. 1. **High Intestinal Obstruction:** In conditions like esophageal atresia (without fistula) or pyloric stenosis with persistent vomiting, air cannot pass beyond the stomach or proximal duodenum. Consequently, the distal bowel remains collapsed and airless. 2. **Acute Pancreatitis:** While often associated with a "sentinel loop," severe acute pancreatitis can lead to a gasless abdomen due to persistent vomiting (clearing the gut of air) and the accumulation of significant inflammatory exudate/ascites that displaces or obscures bowel loops. 3. **Congenital Diaphragmatic Hernia (CDH):** In CDH (specifically the Bochdalek type), the abdominal viscera herniate into the thoracic cavity. This results in a "scaphoid abdomen" clinically and a gasless appearance on an abdominal X-ray because the intestines are simply not present in the abdominal compartment. **Clinical Pearls for NEET-PG:** * **Differential Diagnosis of Gasless Abdomen:** Also includes midgut volvulus (early stage), mesenteric ischemia, and "pseudo-gasless" abdomen (where bowel loops are entirely filled with fluid rather than air). * **CDH High-Yield:** The most common type is **Bochdalek** (posterolateral, usually left-sided). The primary cause of mortality is **pulmonary hypoplasia** and persistent pulmonary hypertension, not the hernia itself. * **X-ray Sign:** In high obstruction like Duodenal Atresia, look for the **"Double Bubble"** sign; if the obstruction is complete and proximal, the rest of the abdomen will be gasless.

Question 178: Which of the following is true about Hirschsprung's disease?

A. Pathology of the myenteric plexus of Auerbach
B. Blood in stools (Correct Answer)
C. May involve the small intestine rarely
D. The involved segment of intestine is dilated

Explanation: **Explanation:** **Hirschsprung’s Disease (Congenital Aganglionic Megacolon)** is characterized by the failure of neural crest cells to migrate cranio-caudally, resulting in an absence of ganglion cells in the distal bowel. **Why "Blood in stools" is the correct answer:** While the classic presentation is delayed passage of meconium (>48 hours) and chronic constipation, **Enterocolitis** (Hirschsprung-associated enterocolitis or HAEC) is the most serious complication. It presents with explosive, foul-smelling diarrhea, fever, and **bloody stools**. In the context of NEET-PG questions, hematochezia is a critical clinical sign indicating this life-threatening inflammatory complication. **Analysis of Incorrect Options:** * **Option A:** The pathology involves the absence of ganglion cells in **both** the **Myenteric (Auerbach’s)** and **Submucosal (Meissner’s)** plexuses. Stating only one is incomplete/incorrect in a competitive context. * **Option C:** This is actually **true** (Total Colonic Aganglionosis can extend into the small bowel in 5-10% of cases). However, in many standard MCQ banks for NEET-PG, "Blood in stools" is prioritized as the clinical hallmark of its most dangerous complication. * **Option D:** The **involved (aganglionic) segment is narrow** and contracted due to uninhibited muscle tone. It is the **proximal (normal) segment** that becomes massively dilated (megacolon) as it tries to push stool past the obstruction. **High-Yield Clinical Pearls:** * **Gold Standard Diagnosis:** Rectal Suction Biopsy (shows absence of ganglion cells and hypertrophied nerve bundles). * **Radiology:** "Inverted Cone" appearance on Barium Enema (transition zone). * **Associated Condition:** Down Syndrome (Trisomy 21) is seen in ~10% of cases. * **Histochemistry:** Increased **Acetylcholinesterase (AChE)** staining is a diagnostic marker.

Question 179: A child presents with fluid discharge from the umbilicus upon straining. What is the most likely diagnosis?

A. Urachal fistula (Correct Answer)
B. Gastroschisis
C. Patent vitellointestinal duct
D. Congenital umbilical hernia

Explanation: **Explanation:** The correct diagnosis is **Urachal fistula**. The urachus is a vestigial structure that connects the dome of the bladder to the umbilicus during fetal development. Normally, it obliterates to form the median umbilical ligament. If it remains completely patent, it creates a direct communication between the bladder and the umbilicus. When the child strains (increasing intra-abdominal pressure), **urine** is discharged from the umbilicus. **Analysis of Options:** * **Urachal fistula (Correct):** Characterized by the discharge of clear fluid (urine) from the umbilicus. Diagnosis is confirmed by biochemical analysis of the fluid (high urea/creatinine) or a fistulogram/ultrasound. * **Patent Vitellointestinal Duct (PVID):** This connects the midgut to the umbilicus. While it also causes umbilical discharge, the fluid is typically **fecal matter** or mucus, not clear urine. * **Gastroschisis:** A full-thickness abdominal wall defect (usually to the right of the umbilicus) where bowel loops herniate out without a covering sac. It is a neonatal emergency, not a simple discharge. * **Congenital Umbilical Hernia:** A protrusion of abdominal contents through a weak umbilical ring covered by skin. It presents as a bulge that increases with crying/straining but does not involve fluid discharge. **High-Yield Clinical Pearls for NEET-PG:** * **Urachal Remnants:** Can present as a fistula (discharge), cyst (palpable mass between umbilicus and pubis), or sinus (blind-ending tract at the umbilicus). * **Rule of 2s:** A patent vitellointestinal duct is related to Meckel’s Diverticulum. * **Management:** The definitive treatment for a symptomatic urachal fistula is surgical excision of the entire tract. * **Differential:** If the discharge is bloody or contains "cherry-red" mucosa, consider an **umbilical adenoma** (raspberry tumor).

Question 180: All are true about cystic hygroma, except?

A. Pulsatile (Correct Answer)
B. May cause respiratory obstruction
C. Common in the neck
D. Present at birth

Explanation: **Explanation:** Cystic hygroma is a **benign congenital malformation** of the lymphatic system, characterized by the failure of lymphatics to communicate with the venous system, leading to the formation of large, fluid-filled cysts (macrocystic lymphatic malformation). **Why "Pulsatile" is the Correct Answer (The Exception):** Cystic hygromas are **non-pulsatile**. Pulsatility is a clinical feature of arterial malformations or tumors in close proximity to major arteries (e.g., Carotid Body Tumor). A cystic hygroma is typically soft, cystic, painless, and most importantly, **brilliantly transilluminant** due to its clear lymph fluid content. It is also compressible but lacks a cough impulse. **Analysis of Other Options:** * **Common in the neck:** Approximately 70–80% of cystic hygromas occur in the **posterior triangle of the neck** (left side > right side). Other sites include the axilla and mediastinum. * **Present at birth:** About 50–60% are present at birth, and nearly 90% manifest by the age of two years. * **May cause respiratory obstruction:** Large hygromas can compress the trachea or involve the floor of the mouth and tongue (macroglossia), leading to acute airway compromise or feeding difficulties. **High-Yield Clinical Pearls for NEET-PG:** * **Transillumination:** The most characteristic clinical sign (Brilliantly positive). * **Association:** Frequently associated with chromosomal anomalies like **Turner Syndrome** (45, XO), Down Syndrome, and Noonan Syndrome. * **Surgical Anatomy:** They are not restricted by anatomical planes and often "interdigitate" between vital structures (nerves and vessels), making complete surgical excision challenging. * **Treatment:** Surgical excision is the gold standard; however, **Sclerosants** (e.g., OK-432/Picibanil, Bleomycin) are used for macrocystic lesions to reduce size.

Practice by Chapter

Neonatal Physiology

Practice Questions

Congenital Anomalies Overview

Practice Questions

Neonatal Intestinal Obstruction

Practice Questions

Necrotizing Enterocolitis

Practice Questions

Hirschsprung's Disease

Practice Questions

Anorectal Malformations

Practice Questions

Pediatric Hernias

Practice Questions

Pyloric Stenosis

Practice Questions

Biliary Atresia

Practice Questions

Pediatric Tumors

Practice Questions

Congenital Diaphragmatic Hernia

Practice Questions

Pediatric Trauma

Practice Questions

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