Pediatric Surgery Practice Questions

Q: A newborn infant presents with bilious vomiting and epigastric distention immediately following birth. What is the most likely diagnosis?

Atresia of the third part of the duodenum. **Explanation:** The clinical presentation of **bilious vomiting** in a newborn is a surgical emergency until proven otherwise. It indicates an obstruction **distal to the Ampulla of Vater** (where the common bile duct enters the second part of the duodenum). **1. Why Option D is Correct:** Duodenal atresia most commonly occurs at the junction of the 2nd and 3rd parts of the duodenum. Because the obstruction is distal to the biliary drainage, the vomitus contains bile. The **epigastric distention** occurs because the stomach and the proximal duodenum become dilated (the classic "Double Bubble" sign on X-ray), while the rest of the abdomen remains scaphoid or flat. **2. Why Other Options are Incorrect:** * **Esophageal Atresia (A):** Presents with drooling, choking, and cyanosis during feeds. Vomiting is non-bilious as the food never reaches the stomach. * **Congenital Hypertrophic Pyloric Stenosis (B):** Typically presents at **3–6 weeks** of age (not at birth) with **non-bilious**, projectile vomiting. The obstruction is proximal to the Ampulla of Vater. * **Gastric Outlet Obstruction (C):** Similar to pyloric stenosis, any obstruction at the level of the stomach or pylorus results in **non-bilious** vomiting. **High-Yield Clinical Pearls for NEET-PG:** * **Duodenal Atresia Association:** 30% of cases are associated with **Down Syndrome (Trisomy 21)**. * **Radiology:** The pathognomonic finding is the **"Double Bubble Sign"** (air in the stomach and proximal duodenum). * **Polyhydramnios:** Often noted in the maternal prenatal history due to the fetus's inability to swallow and absorb amniotic fluid. * **Management:** Initial resuscitation followed by **Duodenoduodenostomy** (Diamond-shaped anastomosis).

Q: Cystic hygroma is known to occur in all of the following locations except?

Calf. **Explanation:** **Cystic hygroma** (also known as macrocystic lymphatic malformation) is a congenital malformation of the lymphatic system. It occurs due to the failure of lymphangiomatous buds to establish a connection with the venous system, leading to the sequestration of lymphatic tissue and subsequent cystic dilatation. **Why Calf is the Correct Answer:** Cystic hygromas predominantly occur in areas where major lymphatic sacs are located during embryonic development. These sacs are found in the neck, axilla, mediastinum, and retroperitoneum. The **calf** is an extremely rare site for a primary cystic hygroma because it lacks these primitive lymphatic centers. While lymphangiomas can occur in the extremities, they are usually of the "cavernous" or "capillary" type rather than the classic "cystic hygroma" seen in the neck. **Analysis of Other Options:** * **Neck (70-80%):** The most common site (specifically the posterior triangle), as it arises from the jugular lymph sacs. * **Axilla (20%):** The second most common site, arising from the subclavian lymph sacs. * **Mediastinum (5%):** Occurs due to the extension of a cervical hygroma or primary development from mediastinal lymph channels. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Feature:** It is a soft, painless, compressible, and **brilliantly transilluminant** mass. * **Association:** Frequently associated with chromosomal anomalies, most commonly **Turner Syndrome** (45, XO), Down Syndrome, and Noonan Syndrome. * **Complications:** Sudden increase in size usually indicates **hemorrhage** into the cyst or infection. * **Treatment of Choice:** Surgical excision is the gold standard. For unresectable cases, sclerotherapy (e.g., OK-432/Picibanil, Bleomycin) is used.

Q: What is the recommended treatment for annular pancreas?

Duodenoduodenostomy. **Explanation:** **Annular pancreas** is a congenital anomaly where a ring of pancreatic tissue encircles the second part of the duodenum, leading to extrinsic obstruction. **Why Duodenoduodenostomy is the Correct Answer:** The gold standard treatment for symptomatic annular pancreas is a **bypass procedure**, specifically **Duodenoduodenostomy** (Kimura’s procedure). This involves creating an anastomosis between the proximal dilated duodenum and the distal collapsed duodenum. It is preferred because it is the most physiological bypass, restoring normal intestinal continuity while avoiding the risks associated with direct pancreatic surgery. **Why Other Options are Incorrect:** * **Conservative management:** This is inappropriate for symptomatic cases as the mechanical obstruction requires surgical intervention to allow feeding and prevent complications. * **Gastrojejunostomy:** While it bypasses the obstruction, it is less physiological than duodenoduodenostomy and carries a higher risk of stomal ulcers and "blind loop" syndrome in neonates. * **Surgical resection of the pancreatic segment:** This is **strictly contraindicated**. Attempting to divide or resect the ring often leads to pancreatic fistulas, pancreatitis, or damage to the underlying common bile duct or pancreatic ducts which are often intramural. **High-Yield Clinical Pearls for NEET-PG:** * **Embryology:** Caused by the failure of the **ventral pancreatic bud** to rotate correctly. * **Clinical Presentation:** Presents with features of proximal intestinal obstruction (non-bilious or bilious vomiting depending on the site of the ring relative to the Ampulla of Vater). * **Radiology:** Characterized by the **"Double Bubble Sign"** on X-ray (similar to duodenal atresia). * **Associations:** Frequently associated with **Down Syndrome (Trisomy 21)**, malrotation, and cardiac defects.

Q: 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?

Intussusception. **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).

Q: A one-day-old infant presents with a specific clinical condition. What is the treatment of choice?

Posterior sagittal anorectoplasty. ***Posterior sagittal anorectoplasty*** - **PSARP (Peña procedure)** is the gold standard definitive treatment for **imperforate anus** and anorectal malformations in neonates. - This technique provides optimal **functional outcomes** by creating a new anal opening with proper alignment of the **anal sphincter complex**. *Exploratory laparotomy* - Not indicated as a primary treatment for **anorectal malformations** since the diagnosis is clinically apparent. - **Laparotomy** would be unnecessarily invasive and does not address the specific anatomical defect requiring specialized reconstruction. *Colostomy* - May be used as a **temporary diversion** in complex cases but is not the definitive treatment for imperforate anus. - **Colostomy** alone does not correct the underlying **anorectal malformation** and requires subsequent definitive repair. *Urinary catheterization* - Completely **irrelevant** to the treatment of anorectal malformations in neonates. - This intervention addresses **urinary tract** issues, not the **gastrointestinal anomaly** present in imperforate anus.

Q: What is the most common type of hypospadias?

Glandular. **Explanation:** Hypospadias is a congenital anomaly characterized by the failure of the urethral folds to fuse, resulting in the urethral meatus opening on the ventral aspect of the penis. **Why Glandular is correct:** Hypospadias is classified based on the anatomical location of the ectopic meatus. Statistically, the most common types are the **distal varieties**, which account for approximately **65-70%** of all cases. Among these, the **glandular (coronal)** type is the most frequent. In this form, the opening is located on the glans penis or at the coronal sulcus. **Analysis of Incorrect Options:** * **B. Penile:** These are intermediate types (mid-shaft) and are less common than distal varieties. * **C. & D. Scrotal and Perineal:** These are classified as **proximal hypospadias**. While they are the most severe forms and often associated with significant chordee (ventral curvature) and bifid scrotum, they are the least common, representing only about 10-15% of cases. **Clinical Pearls for NEET-PG:** * **Triad of Hypospadias:** Ectopic urethral meatus, Chordee (ventral curvature), and Hooded prepuce (deficient ventral foreskin). * **Contraindication:** Circumcision is **strictly contraindicated** in newborns with hypospadias because the prepuce is required for future surgical reconstruction (urethroplasty). * **Ideal Age for Surgery:** Usually performed between **6 to 12 months** of age. * **Associated Anomalies:** Cryptorchidism (undescended testis) and inguinal hernias are the most common associated findings. If a patient has hypospadias and undescended testes, a workup for Disorders of Sex Development (DSD) is mandatory.

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

Blood in stools. **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 1

What is the end-stage treatment for Tetralogy of Fallot?

Accepted Answer

Modified Blalock-Taussig shunt

Answer

Blalock-Taussig shunt

Answer

Waterston shunt

Answer

Pott shunt operation

Question 2

A newborn infant presents with bilious vomiting and epigastric distention immediately following birth. What is the most likely diagnosis?

Accepted Answer

Atresia of the third part of the duodenum

Answer

Esophageal atresia

Answer

Congenital pyloric stenosis

Answer

Gastric outlet obstruction

Question 3

Which of the following should contraindicate the performance of the Fontan procedure?

Accepted Answer

Left ventricular end-diastolic pressure of 18 mm Hg.

Answer

Patient age of 25 years.

Answer

Severe mitral insufficiency.

Answer

Right pulmonary artery stenosis.

Question 4

Cystic hygroma is known to occur in all of the following locations except?

Accepted Answer

Calf

Answer

Neck

Answer

Axilla

Answer

Mediastinum

Question 5

What is the recommended treatment for annular pancreas?

Accepted Answer

Duodenoduodenostomy

Answer

Conservative management

Answer

Gastrojejunostomy

Answer

Surgical resection of the affected pancreatic segment

Question 6

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?

Accepted Answer

Intussusception

Answer

Meckel's diverticulum

Answer

Volvulus

Answer

Hypertrophic pyloric stenosis

Question 7

A one-day-old infant presents with a specific clinical condition. What is the treatment of choice?

Accepted Answer

Posterior sagittal anorectoplasty

Answer

Exploratory laparotomy

Answer

Colostomy

Answer

Urinary catheterization

Question 8

What is the most common type of hypospadias?

Accepted Answer

Glandular

Answer

Penile

Answer

Scrotal

Answer

Perineal

Question 9

Which of the following statements is NOT true about herniotomy?

Accepted Answer

Has a lower recurrence rate.

Answer

Done in congenital inguinal hernia cases.

Answer

Contents are reduced and the sac is closed, but the defect is left without suturing.

Answer

Can also be done in congenital hydrocele.

Question 10

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

Accepted Answer

Blood in stools

Answer

Pathology of the myenteric plexus of Auerbach

Answer

May involve the small intestine rarely

Answer

The involved segment of intestine is dilated

Pediatric Surgery — MCQs

Pediatric Surgery — MCQs

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