Pediatric Surgery — MCQs

A 4-year-old child presented with a solitary painless mass on the neck. The parents reported that the mass would usually swell and become tender during episodes of upper respiratory tract infection. On examination, a smooth, nontender, fluctuant mass was observed along the lower one third of the anteromedial border of the sternocleidomastoid muscle, situated between the muscle and the overlying skin. Following CECT neck, the question is: The described structure develops due to the failure of obliteration of which embryonic component?

Q77Easy

What is most characteristic of congenital hypertrophic pyloric stenosis?

Q78Medium

Which statement regarding congenital umbilical hernia is false?

Q79Medium

Hypochloremic alkalosis is seen in which of the following conditions?

Q80Easy

Recurrent intussusception occurs in about what percentage of cases?

Pediatric Surgery Indian Medical PG Practice Questions and MCQs

Question 71: What is the surgical procedure for undescended testis?

A. Undescended testis (Correct Answer)
B. Ectopic testis
C. Retractile testis
D. Testicular torsion

Explanation: The surgical procedure for an undescended testis (UDT) is **Orchidopexy** (or Orchiopexy). The primary goal is to mobilize the testis and fix it within the scrotal sac to preserve fertility potential and allow for early detection of malignancy. ### **Explanation of Options:** * **A. Undescended Testis (Correct):** Also known as Cryptorchidism, this occurs when the testis fails to descend into the scrotum. Surgery is ideally performed between **6 to 12 months of age**. If the testis is palpable, an inguinal orchidopexy is done; if non-palpable, laparoscopy is the gold standard for diagnosis and management (e.g., Fowler-Stephens procedure). * **B. Ectopic Testis:** This refers to a testis that has descended through the inguinal canal but diverted to an abnormal site (most commonly the superficial inguinal pouch). While it also requires orchidopexy, it is distinct from UDT because it has left the normal path of descent. * **C. Retractile Testis:** This is a normal variant caused by an overactive cremasteric reflex. The testis can be manually brought down into the scrotum and stays there without tension. **No surgery is required**; it only needs periodic observation. * **D. Testicular Torsion:** This is a surgical emergency involving the twisting of the spermatic cord. The procedure required is **Emergency Exploration and Detorsion** with bilateral orchidopexy (to prevent recurrence). ### **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of UDT:** Inguinal canal. * **Most common site of Ectopic testis:** Superficial inguinal pouch (Lockwood’s ligament theory). * **Complications of UDT:** Infertility (most common), Testicular Malignancy (most common is **Seminoma**), Inguinal Hernia, and Torsion. * **Orchidopexy** reduces the risk of torsion and infertility but **does not eliminate** the risk of malignancy; it only makes the testis accessible for screening.

Question 72: Duhamel's operation is indicated for which of the following conditions?

A. Hirschsprung's disease (Correct Answer)
B. Meconium ileus
C. Annular pancreas
D. Imperforate anus

Explanation: **Explanation:** **Hirschsprung’s Disease (Correct Answer):** Hirschsprung’s disease is characterized by the absence of ganglion cells in the myenteric and submucosal plexuses, leading to a functional bowel obstruction. The surgical management aims to bypass or remove the aganglionic segment. **Duhamel’s procedure** (Retrorectal Pull-through) is one of the classic definitive surgeries. In this technique, the normal ganglionic colon is pulled down behind the rectum (retrorectal space) and anastomosed side-to-side with the rectum. This creates a "neorectum" that preserves the sensory function of the anterior rectal wall while providing a functional posterior wall. **Incorrect Options:** * **Meconium Ileus:** This is a manifestation of Cystic Fibrosis where thick, inspissated meconium obstructs the terminal ileum. Management involves Gastrografin enemas or surgeries like Bishop-Koop or Santulli enterostomy. * **Annular Pancreas:** This is a congenital anomaly where a ring of pancreatic tissue encircles the duodenum. The treatment of choice is a bypass procedure, typically a **Duodenoduodenostomy**. * **Imperforate Anus:** Part of the Anorectal Malformation (ARM) spectrum. The gold standard surgical repair is the **Posterior Sagittal Anorectoplasty (PSARP)**, also known as the Pena procedure. **High-Yield Clinical Pearls for NEET-PG:** * **Other Surgeries for Hirschsprung’s:** Swenson (End-to-end), Soave (Endorectal pull-through), and the modern Transanal Endorectal Pull-through (TEPT). * **Gold Standard Diagnosis:** Rectal Suction Biopsy (shows absence of ganglion cells and hypertrophied nerve bundles). * **Duhamel’s Advantage:** It is technically easier than Swenson’s and avoids extensive pelvic dissection, reducing the risk of injury to pelvic nerves (preserving bladder and sexual function).

Question 73: What is the most common site of meningomyelocele?

A. Lumbosacral (Correct Answer)
B. Cranial
C. Thoracic
D. None of the above

Explanation: **Explanation:** **Meningomyelocele** is the most common and severe form of open neural tube defect (spina bifida cystica), characterized by the herniation of both the meninges and the spinal cord through a vertebral defect. **Why Lumbosacral is Correct:** The neural tube closes in a bidirectional manner, starting in the cervical region and progressing cranially and caudally. The **caudal neuropore** (the tail end) is the last part of the neural tube to close, typically around the 26th day of gestation. Because this area is the final site of closure, it is most susceptible to developmental failures. Consequently, approximately **75-80%** of all meningomyeloceles occur in the **lumbosacral region**. **Analysis of Incorrect Options:** * **Cranial:** Defects in the cranial region lead to conditions like *encephalocele* or *anencephaly*. While serious, these are statistically less common than spinal defects. * **Thoracic:** While meningomyeloceles can occur in the thoracic spine, they are much rarer than lumbosacral lesions. Thoracic lesions are often associated with more profound neurological deficits and kyphosis. **NEET-PG High-Yield Pearls:** * **Associated Malformation:** Almost all cases of lumbosacral meningomyelocele are associated with **Arnold-Chiari Malformation Type II** (downward displacement of cerebellar tonsils) and subsequent hydrocephalus. * **Screening:** Elevated **Alpha-fetoprotein (AFP)** in maternal serum and amniotic fluid is a key screening marker. * **Prevention:** Periconceptional intake of **Folic acid (400 mcg/day)** significantly reduces the incidence. * **Clinical Sign:** Look for a "tuft of hair," birthmark, or dimple in cases of *spina bifida occulta* (the mildest form).

Question 74: What is a major indication for orthognathic surgery before puberty?

A. Transverse deficiency of the maxilla
B. Ankylosis of the mandible (Correct Answer)
C. Prognathic mandible
D. Hyperdivergent facial pattern with anterior open bite

Explanation: **Explanation:** In pediatric surgery and orthodontics, the general rule is to delay orthognathic surgery until **skeletal maturity** (post-puberty) to prevent surgical relapse caused by ongoing bone growth. However, **Ankylosis of the mandible (Option B)** is a critical exception. **Why Ankylosis is the Correct Answer:** Temporomandibular joint (TMJ) ankylosis in a growing child leads to severe functional and developmental consequences. It causes restricted mouth opening (leading to malnutrition and poor oral hygiene) and, more importantly, **growth retardation of the mandible**. This results in "Bird-face deformity" and potential airway obstruction (Obstructive Sleep Apnea). Early surgical intervention (gap arthroplasty or distraction osteogenesis) is mandatory to restore function and minimize secondary facial asymmetry, regardless of the child's age. **Analysis of Incorrect Options:** * **Transverse deficiency of the maxilla (Option A):** This is typically managed with **Rapid Maxillary Expansion (RME)**, which is a non-surgical or minimally invasive orthodontic procedure, not major orthognathic surgery. * **Prognathic mandible (Option C):** Surgery for mandibular excess is strictly delayed until growth ceases (usually age 18-20). Operating early carries a very high risk of the mandible outgrowing the surgical correction. * **Hyperdivergent facial pattern (Option D):** This is a vertical growth discrepancy. Like most skeletal malocclusions, definitive orthognathic correction (e.g., LeFort I osteotomy) is deferred until skeletal maturity to ensure stability. **High-Yield Clinical Pearls for NEET-PG:** * **Bird-face deformity:** Characterized by micrognathia and retruded chin, classic of bilateral TMJ ankylosis. * **Distraction Osteogenesis:** Often the preferred technique for early mandibular lengthening in pediatric patients with ankylosis or Pierre Robin Sequence. * **Growth Assessment:** Hand-wrist radiographs or Cervical Vertebral Maturation (CVM) indicators are used to determine if a patient has reached the skeletal maturity required for elective orthognathic surgery.

Question 75: Intussusception usually begins from which anatomical location?

A. Jejunum
B. Colon
C. Terminal ileum (Correct Answer)
D. Rectum

Explanation: **Explanation:** Intussusception is the telescoping of a proximal segment of the bowel (intussusceptum) into an adjacent distal segment (intussuscipiens). **1. Why Terminal Ileum is Correct:** The most common type of intussusception is **Ileocolic (75-90% of cases)**. It typically originates at or near the **terminal ileum**, just proximal to the ileocecal valve. This area is anatomically prone to intussusception due to the abundance of lymphoid tissue (Peyer’s patches) in the terminal ileum. In children, viral infections often cause lymphoid hyperplasia, which acts as a "pathological lead point," allowing the terminal ileum to prolapse into the cecum. **2. Analysis of Incorrect Options:** * **Jejunum (A):** While jejuno-jejunal intussusception can occur, it is rare and usually associated with specific lead points like Henoch-Schönlein purpura or postoperative states. * **Colon (B):** Colo-colic intussusception is less common in children and, when present, is often associated with a distinct lead point like a polyp or malignancy. * **Rectum (D):** The rectum is a fixed retroperitoneal structure and is the endpoint of the intussusceptum (prolapse through the anus), not the site of origin. **3. Clinical Pearls for NEET-PG:** * **Classic Triad:** Intermittent abdominal pain, "currant jelly" stools, and a palpable sausage-shaped mass (usually in the right upper quadrant). * **Dance’s Sign:** Emptiness in the right iliac fossa. * **Diagnosis:** Ultrasound is the gold standard (**Target or Donut sign**). * **Treatment:** Non-operative reduction using **Air or Hydrostatic (Barium/Saline) enema** is the first-line treatment if there are no signs of peritonitis or perforation.

Question 76: A 4-year-old child presented with a solitary painless mass on the neck. The parents reported that the mass would usually swell and become tender during episodes of upper respiratory tract infection. On examination, a smooth, nontender, fluctuant mass was observed along the lower one third of the anteromedial border of the sternocleidomastoid muscle, situated between the muscle and the overlying skin. Following CECT neck, the question is: The described structure develops due to the failure of obliteration of which embryonic component?

A. Second pharyngeal cleft (Correct Answer)
B. Second pharyngeal pouch
C. Second pharyngeal arch
D. Third pharyngeal cleft

Explanation: **Explanation:** The clinical presentation describes a **Branchial Cyst**, specifically a **Second Branchial Cleft Cyst**, which is the most common type (95%) of branchial apparatus anomalies. **Why Option A is correct:** During the 5th week of development, the second pharyngeal arch grows downward and covers the third and fourth arches, burying the second, third, and fourth pharyngeal clefts. This creates a temporary space called the **Cervical Sinus of His**. Normally, this sinus obliterates. Failure of the **second pharyngeal cleft** to obliterate results in a branchial cyst. These typically present along the **lower 1/3rd of the anteromedial border of the sternocleidomastoid muscle**, often enlarging during upper respiratory tract infections due to lymphoid tissue stimulation within the cyst wall. **Why other options are incorrect:** * **Option B (Second pharyngeal pouch):** Derivatives of the second pouch include the palatine tonsils. Persistent pouch components would lead to internal fistulae opening into the oropharynx (tonsillar fossa), not a superficial neck mass. * **Option C (Second pharyngeal arch):** Arches give rise to muscles, nerves, and skeletal structures (e.g., muscles of facial expression, stapes). Failure of arch development leads to structural hypoplasia, not cystic masses. * **Option D (Third pharyngeal cleft):** Anomalies of the third cleft are rare. They typically present lower in the neck and their tract passes *behind* the internal carotid artery, whereas second cleft tracts pass *between* the internal and external carotid arteries. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Second branchial cysts are always deep to the platysma but superficial to the carotid sheath. * **Tract Path:** If a fistula is present, it travels from the skin, between the internal and external carotids, and opens into the **tonsillar fossa**. * **Differential:** Unlike a Thyroglossal cyst, a Branchial cyst is **lateral** and **does not move** with deglutition or protrusion of the tongue. * **Treatment:** Complete surgical excision (Sistrunk procedure is for thyroglossal cysts; simple excision is for branchial cysts).

Question 77: What is most characteristic of congenital hypertrophic pyloric stenosis?

A. Affects the first-born female child
B. The pyloric tumor is best felt during feeding (Correct Answer)
C. The patient is commonly marasmic
D. Loss of appetite occurs early

Explanation: **Congenital Hypertrophic Pyloric Stenosis (CHPS)** is a common cause of gastric outlet obstruction in infants, characterized by hypertrophy and hyperplasia of the circular muscle layers of the pylorus. ### **Explanation of the Correct Option** **B. The pyloric tumor is best felt during feeding:** This is the clinical hallmark of CHPS. The "olive-shaped" mass (the hypertrophied pylorus) is most palpable in the right epigastrium or right upper quadrant. During feeding, the abdominal wall relaxes, and the stomach initiates peristaltic waves. This makes the tumor more prominent and easier to palpate as it moves under the examiner's hand. ### **Explanation of Incorrect Options** * **A. Affects the first-born female child:** This is incorrect. CHPS classically affects **first-born male children** (Male to Female ratio is 4:1). * **C. The patient is commonly marasmic:** While infants can become dehydrated and lose weight, they are rarely "marasmic" (severe protein-energy malnutrition) because the symptoms typically present acutely between **3 to 6 weeks of age**, prompting early medical intervention. * **D. Loss of appetite occurs early:** This is incorrect. Infants with CHPS are famously **"hungry vomiters."** Despite the projectile, non-bilious vomiting, they maintain a vigorous appetite and eager desire to feed immediately after vomiting. ### **High-Yield Clinical Pearls for NEET-PG** * **Metabolic Abnormality:** The classic triad is **Hypochloremic, Hypokalemic, Metabolic Alkalosis** with **Paradoxical Aciduria**. * **Clinical Signs:** Visible gastric peristalsis (left to right) and the "Olive" mass. * **Investigation of Choice:** **Ultrasonography** (Criteria: Pyloric muscle thickness >4mm or length >14mm). * **Barium Swallow Sign:** "String sign," "Beak sign," or "Shoulder sign." * **Management:** Initial resuscitation with Normal Saline (0.9% NaCl) followed by the definitive surgery: **Ramstedt’s Pyloromyotomy**.

Question 78: Which statement regarding congenital umbilical hernia is false?

A. Protrusion of abdominal contents through a paraumbilical defect (Correct Answer)
B. Covered by a peritoneal sac
C. Herniated viscera may include stomach and bowel
D. Occurs in term babies

Explanation: ### Explanation **1. Why Option A is the correct (False) statement:** The defining feature of a **congenital umbilical hernia** is that the defect occurs **directly through the umbilical ring**, not a paraumbilical site. A paraumbilical hernia is an acquired condition, typically seen in adults, where the defect occurs in the linea alba just above or below the umbilicus. In congenital cases, the failure of the umbilical ring to close completely after birth allows the protrusion. **2. Analysis of other options:** * **Option B (Covered by a peritoneal sac):** This is **true**. Unlike gastroschisis, an umbilical hernia is a true hernia, meaning the protruding contents are always contained within a sac consisting of peritoneum and skin. * **Option C (Herniated viscera may include stomach and bowel):** This is **true**. While small bowel loops are the most common contents, in cases of large defects, the stomach or omentum can also herniate. * **Option D (Occurs in term babies):** This is **true**. While the incidence is significantly higher in premature infants (up to 75-80%), it frequently occurs in full-term babies as well. **3. Clinical Pearls for NEET-PG:** * **Natural History:** Most umbilical hernias (approx. 80-90%) close spontaneously by the age of 3–4 years as the abdominal muscles strengthen. * **Indications for Surgery:** Repair (Herniorrhaphy) is indicated if the defect is **>1.5 cm after age 2**, if it persists beyond **age 4–5**, or if complications like strangulation occur (though incarceration is rare). * **Associations:** High incidence in infants with **Down syndrome, Trisomy 13, 18, Beckwith-Wiedemann syndrome, and Congenital Hypothyroidism.** * **Differential:** Do not confuse with **Omphalocele**, where the defect is much larger and contents are covered only by a thin membrane (amnion and peritoneum) without skin.

Question 79: Hypochloremic alkalosis is seen in which of the following conditions?

A. Achalasia cardia
B. Congenital hypertrophic pyloric stenosis (Correct Answer)
C. Ureterosigmoidostomy
D. Diarrhea

Explanation: **Explanation:** **Congenital Hypertrophic Pyloric Stenosis (CHPS)** is the classic cause of **Hypochloremic, Hypokalemic Metabolic Alkalosis with Paradoxical Aciduria**. The underlying mechanism involves persistent non-bilious projectile vomiting, leading to a significant loss of gastric juice. Gastric juice is rich in Hydrochloric acid (HCl), Potassium (K+), and Water. * **Hypochloremia:** Loss of Cl⁻ ions from gastric acid. * **Alkalosis:** Loss of H⁺ ions leads to an increase in serum bicarbonate. * **Paradoxical Aciduria:** To conserve volume (due to dehydration), the kidney reabsorbs Na⁺ in exchange for H⁺ in the distal tubule (once K⁺ stores are depleted), resulting in acidic urine despite systemic alkalosis. **Incorrect Options:** * **Achalasia Cardia:** While vomiting/regurgitation occurs, it involves undigested food that has not yet mixed with gastric acid; thus, it does not typically cause significant electrolyte disturbances. * **Ureterosigmoidostomy:** This leads to **Hyperchloremic Metabolic Acidosis** because the colonic mucosa reabsorbs Chloride in exchange for Bicarbonate. * **Diarrhea:** This typically results in **Hyperchloremic Metabolic Acidosis** due to the massive loss of bicarbonate-rich intestinal secretions. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Triad:** Projectile non-bilious vomiting, palpable "olive-shaped" mass in the epigastrium, and visible gastric peristalsis. * **Investigation of Choice:** Ultrasound (Criteria: Pyloric muscle thickness >4mm, Pyloric canal length >14mm). * **Management:** Initial priority is correction of dehydration and electrolyte imbalance (Normal Saline is the fluid of choice). Definitive surgery is **Ramstedt’s Pyloromyotomy**.

Question 80: Recurrent intussusception occurs in about what percentage of cases?

A. Less than 1%
B. 1-5%
C. 5-10% (Correct Answer)
D. 10-20%

Explanation: **Explanation:** Intussusception is the most common cause of intestinal obstruction in infants (6–36 months). While most cases are successfully managed with non-operative reduction, recurrence is a well-documented clinical challenge. **1. Why 5–10% is Correct:** Large-scale clinical studies and standard surgical textbooks (like Bailey & Love and Nelson’s Pediatrics) indicate that the recurrence rate of intussusception ranges between **5% and 10%**. * **Non-operative reduction (Hydrostatic/Pneumatic):** Recurrence is more common here (approx. 10%) because the underlying cause (often lymphoid hyperplasia) remains. * **Surgical reduction:** Recurrence is lower (approx. 1–5%) due to the formation of serosal adhesions which "fix" the bowel in place. * **Bowel Resection:** Recurrence is almost 0% as the lead point and the susceptible segment are removed. **2. Analysis of Incorrect Options:** * **A (<1%):** This is too low. Even with surgical intervention, the rate is higher than 1%. * **B (1–5%):** This represents the recurrence rate specifically for *surgical* reduction, but does not reflect the overall incidence which includes the more common non-operative reductions. * **D (10–20%):** This is an overestimation. While some specific subsets might approach 10-12%, the standard accepted range for the general pediatric population is 5–10%. **High-Yield Clinical Pearls for NEET-PG:** * **Lead Point:** In children <2 years, it is usually **idiopathic** (secondary to Peyer’s patch hypertrophy after viral illness). In children >2 years, look for a **pathological lead point** (Meckel’s diverticulum is the most common). * **Diagnosis:** Ultrasound is the gold standard (**Target/Donut sign**). * **Management:** Air/Pneumatic reduction is currently the preferred initial treatment (higher success rate than hydrostatic). * **Recurrence Timing:** Most recurrences occur within 72 hours, but they can happen months later. Multiple recurrences should prompt a search for a pathological lead point.

Practice by Chapter

Neonatal Physiology

Practice Questions

Congenital Anomalies Overview

Practice Questions

Neonatal Intestinal Obstruction

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Necrotizing Enterocolitis

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Hirschsprung's Disease

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Anorectal Malformations

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Pediatric Hernias

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Pyloric Stenosis

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Biliary Atresia

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Pediatric Tumors

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Congenital Diaphragmatic Hernia

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Pediatric Trauma

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