Pediatric Surgery — MCQs
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Ramstead's operation is performed for which condition?
At what age is orchiopexy typically performed?
What is the metabolic disturbance seen with pyloric stenosis?
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?
In Meckel's diverticulum, how is ectopic gastric tissue diagnosed?
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?
What is the investigation of choice for Hirschsprung's disease?
What is the management of a 1-week-old baby presenting with imperforate anus and meconuria?
A child was operated for intussusception. He underwent resection of the affected ileal segment which revealed a tumor. What is the most likely tumor?
Which of the following statements concerning imperforate anus is true?
Pediatric Surgery Indian Medical PG Practice Questions and MCQs
Question 181: Ramstead's operation is performed for which condition?
- A. Congenital hypertrophic pyloric stenosis (Correct Answer)
- B. Achalasia cardia
- C. Diffuse esophageal spasm
- D. Carcinoma of the esophagus
Explanation: **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.
Question 182: At what age is orchiopexy typically performed?
- A. 2 months
- B. 6 months (Correct Answer)
- C. 12 months
- D. 24 months
Explanation: **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.
Question 183: What is the metabolic disturbance seen with pyloric stenosis?
- A. Hypokalemic hyponatremic alkalosis (Correct Answer)
- B. Hyperkalemia
- C. Hyperchloremic acidosis
- D. Hypernatremia
Explanation: ### 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.**
Question 184: 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?
- A. Anal atresia
- B. Malrotation of the gut
- C. Hirschsprung's disease (Correct Answer)
- D. Congenital megacolon
Explanation: ### Explanation **Hirschsprung’s Disease (HD)** is the most probable diagnosis based on the classic triad of chronic constipation, abdominal distension, and specific radiological findings. **1. Why Hirschsprung’s Disease is Correct:** The underlying pathology is the **absence of ganglion cells** (Auerbach’s and Meissner’s plexuses) in the distal bowel due to the failure of neural crest cell migration. This results in a functional obstruction where the aganglionic segment remains permanently contracted. * **Transition Zone:** On barium enema, the narrow aganglionic segment distal to the dilated proximal (normal) colon creates a "transition zone." * **Reversed Recto-sigmoid Ratio:** Normally, the rectum is wider than the sigmoid (Ratio >1). In HD, the rectum is narrow and the sigmoid is dilated, reversing this ratio (<1). This is a pathognomonic radiological sign. **2. Why Other Options are Incorrect:** * **Anal Atresia:** This is a neonatal emergency presenting at birth with failure to pass meconium and an absent anal opening. It would not present as a two-year history of constipation in a three-year-old. * **Malrotation of the Gut:** Typically presents in the neonatal period with **bilious vomiting** due to midgut volvulus or Ladd’s bands, not chronic constipation with a transition zone. * **Congenital Megacolon:** While this is a descriptive term often used synonymously with HD, in the context of a NEET-PG question, **Hirschsprung’s Disease** is the specific clinical diagnosis. "Megacolon" is the *result* of the disease, not the disease itself. **3. Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Full-thickness rectal biopsy (showing absence of ganglion cells and hypertrophied nerve bundles). * **Screening Test:** Anorectal Manometry (shows absence of Recto-Anal Inhibitory Reflex - RAIR). * **Histochemistry:** Increased **Acetylcholinesterase (AChE)** staining is a high-yield diagnostic marker. * **Associated Condition:** Strongly associated with **Down Syndrome** (Trisomy 21). * **Initial Management:** Rectal washouts to decompress the bowel before definitive "pull-through" surgery (e.g., Duhamel, Soave, or Swenson procedures).
Question 185: In Meckel's diverticulum, how is ectopic gastric tissue diagnosed?
- A. Radionuclide scan (Correct Answer)
- B. Endoscopy
- C. Ultrasound
- D. RBC tagged scanning
Explanation: **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.
Question 186: 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?
- A. Hirschsprung disease
- B. Congenital hypertrophic pyloric stenosis
- C. Duodenal atresia
- D. Malrotation of the gut (Correct Answer)
Explanation: ### **Explanation** **Correct Answer: D. Malrotation of the gut** **Why it is correct:** In a neonate, **bilious vomiting** is a surgical emergency until proven otherwise. Malrotation with **midgut volvulus** typically presents within the first week of life. The presence of **gross abdominal distention** and **multiple gas-filled loops** on X-ray indicates a **low intestinal obstruction**. While malrotation often presents with a "double bubble" or "gasless abdomen" if the obstruction is high (duodenal), a volvulus can lead to distal bowel ischemia, paralytic ileus (absent bowel sounds), and generalized dilatation of multiple loops due to total midgut involvement. **Why the other options are incorrect:** * **B. Congenital Hypertrophic Pyloric Stenosis (CHPS):** Characterized by **non-bilious** projectile vomiting, usually appearing at 3–6 weeks of age. X-ray shows a single large gastric air bubble. * **C. Duodenal Atresia:** Presents with bilious vomiting on the first day of life. The classic X-ray finding is the **"Double Bubble" appearance** with a gasless distal abdomen (no multiple loops). * **A. Hirschsprung Disease:** While it causes distention and multiple gas loops, it usually presents with delayed passage of meconium (>48 hours) and rarely presents with sudden-onset acute bilious vomiting and absent bowel sounds in the first week unless complicated by enterocolitis. **NEET-PG High-Yield Pearls:** * **Gold Standard Investigation:** Upper GI Contrast Study (shows "Corkscrew appearance" of the duodenum or misplaced Ligament of Treitz). * **Surgical Management:** **Ladd’s Procedure** (Counter-clockwise detorsion, division of Ladd’s bands, widening of the mesenteric base, and appendectomy). * **Clinical Rule:** Any neonate with bilious vomiting must undergo an urgent Upper GI series to rule out Malrotation. * **Ladd’s Bands:** Peritoneal bands connecting the cecum to the right posterolateral abdominal wall, crossing and obstructing the duodenum.
Question 187: What is the investigation of choice for Hirschsprung's disease?
- A. Rectal manometry
- B. Rectal examination
- C. Rectal biopsy (Correct Answer)
- D. Barium enema
Explanation: **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).
Question 188: What is the management of a 1-week-old baby presenting with imperforate anus and meconuria?
- A. Conservative management
- B. V-Y plasty
- C. Colostomy (Correct Answer)
- D. Ileostomy
Explanation: 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 189: A child was operated for intussusception. He underwent resection of the affected ileal segment which revealed a tumor. What is the most likely tumor?
- A. Lymphoma
- B. Villous adenoma (Correct Answer)
- C. Carcinoid
- D. Smooth muscle tumor
Explanation: **Explanation:** In pediatric surgery, intussusception is typically idiopathic (90% of cases), often following a viral prodrome leading to Peyer’s patch hypertrophy. However, in older children or cases where a **pathological lead point (PLP)** is identified during surgery, a neoplasm must be suspected. **Why Villous Adenoma is the Correct Answer:** While lymphoma is the most common *malignant* cause of intussusception in children, **Villous Adenoma** is a recognized benign epithelial tumor that can act as a lead point. In the context of this specific question (often derived from classic surgical textbooks like Bailey & Love or Sabiston), if a discrete "tumor" is identified in the resected ileal segment of a child, villous adenoma is frequently cited in examination patterns as a primary benign culprit, despite its rarity compared to lymphoid hyperplasia. **Analysis of Incorrect Options:** * **A. Lymphoma:** This is the most common *malignant* lead point in children (specifically Non-Hodgkin Lymphoma). However, if the question implies a discrete, resectable benign-appearing mass found incidentally during surgery, adenomas are often the tested entity. * **C. Carcinoid:** These are the most common tumors of the appendix in children but are extremely rare in the ileum as a cause for pediatric intussusception. * **D. Smooth Muscle Tumor (Leiomyoma):** While these can occur in the GI tract, they are significantly less common than epithelial or lymphoid lesions in the pediatric age group. **Clinical Pearls for NEET-PG:** * **Most common lead point overall:** Meckel’s Diverticulum. * **Most common malignant lead point:** Lymphoma (Burkitt’s). * **Age Factor:** Intussusception in a child >2 years or <6 months strongly suggests a pathological lead point. * **Classic Triad:** Intermittent abdominal pain, "sausage-shaped" mass, and "red currant jelly" stools. * **Investigation of Choice:** Ultrasonography (Target/Donut sign or Pseudokidney sign).
Question 190: Which of the following statements concerning imperforate anus is true?
- A. Imperforate anus affects males more frequently than females.
- B. In 90% of males, but only 50% of females, the rectum ends below the level of the levator ani complex.
- C. The rectum usually ends in a blind pouch.
- D. The chance for eventual continence is greater when the rectum has descended to below the levator ani muscles. (Correct Answer)
Explanation: Anorectal malformations (ARMs), commonly known as imperforate anus, are a spectrum of defects ranging from simple anal stenosis to complex cloacal anomalies. ### **Explanation of the Correct Option** **Option D is correct.** The prognosis for fecal continence depends heavily on the **level of the lesion** relative to the levator ani (puborectalis) muscle complex. In **"low" anomalies** (where the rectum has descended below the levator ani), the sphincter mechanism is usually well-developed, and the nerve supply is intact, leading to an excellent prognosis for continence (nearly 100%). In "high" anomalies, the rectum ends above the levator complex, often associated with poor muscle development and sacral nerve defects, leading to a much lower chance of continence. ### **Analysis of Incorrect Options** * **Option A:** Imperforate anus affects males and females with **roughly equal frequency** (incidence approx. 1 in 5,000 live births). * **Option B:** This statement is statistically incorrect. In both males and females, **low anomalies are generally more common** and have a better prognosis, but the 90%/50% distribution is not a recognized clinical standard. * **Option C:** The rectum **rarely ends in a blind pouch.** In over 90% of cases, there is a **fistula** connecting the distal rectum to the perineum or the urogenital tract (e.g., rectovesical, rectourethral in males; rectovestibular in females). ### **NEET-PG High-Yield Pearls** * **VACTERL Association:** Always screen for other anomalies (Vertebral, Anal, Cardiac, Tracheo-Esophageal, Renal, and Limb). Vertebral/Sacral defects are the most common. * **Initial Management:** Do not rush to surgery. Wait **24 hours** to allow intraluminal pressure to rise, which helps determine the level of the lesion (via clinical exam or invertogram). * **Invertogram (Wangensteen-Rice view):** Used to classify high vs. low lesions. The landmark is the **P-line (Pubococcygeal line)**. * **Surgical Gold Standard:** Posterior Sagittal Anorectoplasty (**PSARP**), also known as the **Pena Procedure**.
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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