Pediatric Surgery Practice Questions

Q: Ramstead's operation is performed for which condition?

Congenital hypertrophic pyloric stenosis. **Explanation:** **Ramstedt’s Pyloromyotomy** (also known as Fredet-Ramstedt operation) is the definitive surgical treatment for **Congenital Hypertrophic Pyloric Stenosis (CHPS)**. The procedure involves a longitudinal incision through the hypertrophied circular muscle fibers of the pylorus, down to the submucosa, allowing the mucosa to bulge through and relieving the gastric outlet obstruction. **Analysis of Options:** * **Option A (Correct):** CHPS typically presents in infants (3–6 weeks old) with non-bilious, projectile vomiting. Ramstedt’s operation is the gold standard treatment after correcting electrolyte imbalances (hypochloremic hypokalemic metabolic alkalosis). * **Option B & C:** Achalasia cardia and Diffuse Esophageal Spasm are esophageal motility disorders. The standard surgical treatment for Achalasia is **Heller’s Myotomy**, which involves cutting the muscle fibers of the lower esophageal sphincter. * **Option D:** Carcinoma of the esophagus requires radical procedures like Esophagectomy (e.g., Ivor-Lewis or McKeown procedure), depending on the tumor location and stage. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Sign:** "Olive-shaped mass" palpable in the epigastrium and visible gastric peristalsis. * **Investigation of Choice:** Ultrasonography (Criteria: Pyloric muscle thickness >4mm or channel length >14mm). * **Barium Swallow Sign:** "String sign," "Beak sign," or "Shoulder sign." * **Metabolic Derangement:** Paradoxical aciduria (a classic exam favorite). * **Pre-op Management:** Surgery is **never** an emergency; the priority is correcting dehydration and the metabolic alkalosis with 0.45% or 0.9% Normal Saline with Potassium.

Q: At what age is orchiopexy typically performed?

6 months. **Explanation:** The management of undescended testes (cryptorchidism) is a high-yield topic in pediatric surgery. The primary goal of treatment is to preserve fertility and facilitate early screening for malignancy. **1. Why 6 months is correct:** Spontaneous descent of the testes occurs frequently in the first few months of life, driven by the postnatal testosterone surge (often called "mini-puberty"). However, spontaneous descent is extremely rare after the age of **6 months**. Histological changes, such as the loss of germ cells and Leydig cell atrophy, begin as early as 6–12 months of age. Therefore, current international guidelines (AUA/EAU) recommend that orchiopexy be performed between **6 and 12 months** of age to optimize testicular health. **2. Analysis of Incorrect Options:** * **A. 2 months:** Too early. Many testes will still descend spontaneously during the first 3–4 months of life. * **C. 12 months:** While surgery can be done at this age, 6 months is the preferred starting point to minimize the duration of exposure to higher body temperatures. * **D. 24 months:** Waiting until 2 years is outdated practice. Delayed surgery significantly increases the risk of infertility and makes the testis harder to monitor for future malignancy. **Clinical Pearls for NEET-PG:** * **Most common site:** Inguinal canal. * **Most common complication of Orchiopexy:** Testicular atrophy. * **Malignancy Risk:** Orchiopexy does *not* eliminate the risk of testicular cancer (most commonly Seminoma), but it makes the testis accessible for physical examination. * **HCG Therapy:** Rarely used now; surgery is the gold standard. * **Laparoscopy:** The investigation of choice for a non-palpable testis.

Q: What is the metabolic disturbance seen with pyloric stenosis?

Hypokalemic hyponatremic alkalosis. ### Explanation The metabolic hallmark of **Infantile Hypertrophic Pyloric Stenosis (IHPS)** is **Hypochloremic, Hypokalemic, Metabolic Alkalosis with Paradoxical Aciduria.** **Why Option A is Correct:** 1. **Vomiting:** Persistent non-bilious vomiting leads to a massive loss of gastric juice containing **Hydrochloric acid (HCl)**, water, and sodium. 2. **Alkalosis:** The loss of chloride ($Cl^-$) and hydrogen ions ($H^+$) results in metabolic alkalosis. 3. **Hypokalemia:** Initially, the kidney tries to compensate for alkalosis by excreting bicarbonate ($HCO_3^-$) along with sodium. As dehydration worsens, the body activates the **Renin-Angiotensin-Aldosterone System (RAAS)** to conserve sodium. In the distal tubule, sodium is reabsorbed at the expense of secreting potassium ($K^+$) and hydrogen ($H^+$) into the urine. This leads to systemic hypokalemia and **paradoxical aciduria** (acidic urine despite systemic alkalosis). **Why Other Options are Incorrect:** * **B & C:** Hyperkalemia and Hyperchloremic acidosis are typically seen in conditions like renal tubular acidosis or severe diarrhea, which is the opposite of the gastric loss seen in IHPS. * **D:** While dehydration occurs, the primary electrolyte shifts involve the loss of sodium and chloride; hypernatremia is not the characteristic metabolic signature. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Presentation:** 3–6 week old male infant with **projectile, non-bilious vomiting** and a palpable **"olive-shaped" mass** in the epigastrium. * **Diagnosis:** Ultrasound is the investigation of choice (Pyloric muscle thickness >4mm, length >14mm). * **Management:** IHPS is a **medical emergency, not a surgical one.** The priority is correcting dehydration and electrolyte imbalances (using 0.45% or 0.9% NS with $K^+$) before performing a **Ramstedt’s Pyloromyotomy.**

Q: In Meckel's diverticulum, how is ectopic gastric tissue diagnosed?

Radionuclide scan. **Explanation:** The correct answer is **Radionuclide scan (Technetium-99m pertechnetate scan)**, commonly known as the **Meckel’s scan**. 1. **Why it is correct:** Meckel’s diverticulum is a vestigial remnant of the vitellointestinal duct. Approximately 50% of symptomatic cases contain **ectopic gastric mucosa**. The pertechnetate ion ($Tc^{99m}$) has a high affinity for **mucus-secreting cells of the gastric mucosa**. When injected intravenously, the radionuclide accumulates in these cells, allowing the diverticulum to be visualized as a "hot spot" on a gamma camera. This is the investigation of choice for diagnosing bleeding Meckel’s diverticulum in children. 2. **Why other options are incorrect:** * **Endoscopy:** Standard upper or lower GI endoscopy cannot reach the mid-ileum where Meckel’s is typically located (2 feet from the ileocecal valve). Double-balloon enteroscopy is possible but invasive and not the primary diagnostic tool. * **Ultrasound:** While it may occasionally show a "blind-ending pouch," it is non-specific and unreliable for identifying ectopic tissue. * **RBC tagged scanning:** This is used to localize the site of active gastrointestinal bleeding (rate >0.1 mL/min) but does not specifically identify ectopic gastric tissue. **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 age 2. * **Sensitivity Enhancement:** The yield of a Meckel’s scan can be increased using **Pentagastrin** (increases uptake), **H2 blockers/Cimetidine** (prevents release from cells), or **Glucagon** (decreases peristalsis). * **Most common presentation:** Painless lower GI bleeding (hematochezia) in children; intestinal obstruction in adults.

Q: What is the investigation of choice for Hirschsprung's disease?

Rectal biopsy. **Explanation:** **Hirschsprung’s Disease (Congenital Aganglionic Megacolon)** is characterized by the absence of ganglion cells in the Meissner’s and Auerbach’s plexuses, typically starting from the internal anal sphincter and extending proximally. **Why Rectal Biopsy is the Correct Answer:** Full-thickness or suction **rectal biopsy** is the **gold standard and investigation of choice**. The diagnosis is confirmed by the histological demonstration of the **absence of ganglion cells** and the presence of **hypertrophied nerve bundles**. Additionally, Acetylcholinesterase (AChE) staining shows increased nerve fiber activity, which is a key diagnostic marker. **Analysis of Incorrect Options:** * **Rectal Manometry:** This is the most sensitive **screening test**. It shows the absence of the Recto-Anal Inhibitory Reflex (RAIR)—failure of the internal sphincter to relax upon rectal distension. However, it is not confirmatory. * **Rectal Examination:** While a digital exam may result in a "blast sign" (explosive release of stool and gas), it is a clinical finding, not a definitive investigation. * **Barium Enema:** This is used to identify the **"transition zone"** (the area between the narrow aganglionic segment and the dilated proximal colon). While helpful for surgical planning, it can be normal in neonates and is not diagnostic. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Rectosigmoid region (Short-segment disease). * **Gold Standard:** Rectal Biopsy (taken at least 2 cm above the dentate line to avoid the normal hypoganglionic zone). * **Initial Management:** Rectal washouts to decompress the bowel. * **Definitive Surgery:** Pull-through procedures (e.g., Duhamel, Soave, or Swenson techniques).

Q: What is the management of a 1-week-old baby presenting with imperforate anus and meconuria?

Colostomy. In pediatric surgery, the management of Anorectal Malformations (ARM) is determined by the level of the lesion and the presence of a fistula. **Explanation of the Correct Answer:** The presence of **meconuria** (meconium in urine) is a pathognomonic sign of a **High-type ARM** with a **recto-urinary fistula** (recto-vesical or recto-urethral). In a 1-week-old neonate, a high-type lesion is a surgical emergency that cannot be managed by simple perineal procedures. The standard management is a **staged approach**: 1. **Stage 1:** Divided sigmoid **colostomy** to divert the fecal stream, prevent recurrent urinary tract infections (UTIs), and decompress the bowel. 2. **Stage 2:** Definitive repair via Posterior Sagittal Anorectoplasty (PSARP) at a later date. 3. **Stage 3:** Colostomy closure. **Why the other options are incorrect:** * **Conservative management:** This is fatal; the baby has an intestinal obstruction and a risk of severe urosepsis. * **V-Y plasty:** This is a skin flap technique used for minor reconstructive procedures, not for correcting internal anorectal defects. * **Ileostomy:** While it provides diversion, a colostomy is preferred in ARM because it allows for a "distal cologram" (the gold standard to identify the fistula site) and preserves more bowel length for water absorption. **High-Yield Clinical Pearls for NEET-PG:** * **Low-type ARM:** Managed by immediate **Anoplasty** (no colostomy needed). * **High-type ARM:** Managed by **Colostomy** followed by PSARP. * **VACTERL Association:** Always screen these babies for Vertebral, Anal, Cardiac, Tracheo-Esophageal, Renal, and Limb anomalies. * **Invertogram (Wangensteen-Rice view):** Historically used to determine the level of the lesion; it is performed after 18–24 hours of life to allow air to reach the distal rectum.

Question 1

Ramstead's operation is performed for which condition?

Accepted Answer

Congenital hypertrophic pyloric stenosis

Answer

Achalasia cardia

Answer

Diffuse esophageal spasm

Answer

Carcinoma of the esophagus

Question 2

At what age is orchiopexy typically performed?

Accepted Answer

6 months

Answer

2 months

Answer

12 months

Answer

24 months

Question 3

What is the metabolic disturbance seen with pyloric stenosis?

Accepted Answer

Hypokalemic hyponatremic alkalosis

Answer

Hyperkalemia

Answer

Hyperchloremic acidosis

Answer

Hypernatremia

Question 4

A three-year-old male child presents with a two-year history of constipation and abdominal distension. A plain radiograph of the abdomen reveals fecal matter and distended bowel loops. A subsequent barium enema study shows a transition zone at the recto-sigmoid junction with reversal of the recto-sigmoid ratio. What is the most probable diagnosis?

Accepted Answer

Hirschsprung's disease

Answer

Anal atresia

Answer

Malrotation of the gut

Answer

Congenital megacolon

Question 5

In Meckel's diverticulum, how is ectopic gastric tissue diagnosed?

Accepted Answer

Radionuclide scan

Answer

Endoscopy

Answer

Ultrasound

Answer

RBC tagged scanning

Question 6

A 7-day-old infant presents with bilious vomiting, gross abdominal distention, and absent bowel sounds. An X-ray of the abdomen shows multiple gas-filled loops. What is the diagnosis?

Accepted Answer

Malrotation of the gut

Answer

Hirschsprung disease

Answer

Congenital hypertrophic pyloric stenosis

Answer

Duodenal atresia

Question 7

What is the investigation of choice for Hirschsprung's disease?

Accepted Answer

Rectal biopsy

Answer

Rectal manometry

Answer

Rectal examination

Answer

Barium enema

Question 8

What is the management of a 1-week-old baby presenting with imperforate anus and meconuria?

Accepted Answer

Colostomy

Answer

Conservative management

Answer

V-Y plasty

Answer

Ileostomy

Question 9

A child was operated for intussusception. He underwent resection of the affected ileal segment which revealed a tumor. What is the most likely tumor?

Accepted Answer

Villous adenoma

Answer

Lymphoma

Answer

Carcinoid

Answer

Smooth muscle tumor

Question 10

Which of the following statements concerning imperforate anus is true?

Accepted Answer

The chance for eventual continence is greater when the rectum has descended to below the levator ani muscles.

Answer

Imperforate anus affects males more frequently than females.

Answer

In 90% of males, but only 50% of females, the rectum ends below the level of the levator ani complex.

Answer

The rectum usually ends in a blind pouch.

Pediatric Surgery — MCQs

Pediatric Surgery — MCQs

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