Pediatric Surgery Practice Questions

Q: The diagnosis of congenital megacolon is confirmed by:

Rectal biopsy. **Explanation:** **Congenital Megacolon (Hirschsprung Disease)** is characterized by the absence of ganglion cells in the submucosal (Meissner's) and myenteric (Auerbach's) plexuses, typically starting at the internal anal sphincter and extending proximally. **Why Rectal Biopsy is the Correct Answer:** A **rectal biopsy** is the **gold standard** for diagnosis. It provides definitive histological evidence of the disease. The diagnosis is confirmed by two key findings: 1. **Absence of ganglion cells** in the intestinal wall. 2. **Hypertrophy of nerve fibers** (demonstrated via Acetylcholinesterase staining). A "suction biopsy" is usually preferred in neonates as it is painless and does not require anesthesia. **Analysis of Incorrect Options:** * **A. Clinical features:** While symptoms like delayed passage of meconium (>48 hours), abdominal distension, and "blast sign" on digital rectal exam are highly suggestive, they are not confirmatory. * **B. Barium enema:** This is the initial imaging modality of choice. It shows a **"transition zone"** (the narrow aganglionic segment distal to the dilated normal segment). However, it can be false-negative in neonates (total colonic aganglionosis). * **D. Recto-sigmoidoscopy:** This is generally not used for diagnosis as it cannot visualize the microscopic absence of ganglion cells and carries a risk of perforation in a distended bowel. **NEET-PG High-Yield Pearls:** * **Most common site:** Rectosigmoid region (Short-segment disease). * **Associated Condition:** Down Syndrome (Trisomy 21) is seen in ~10% of cases. * **Anorectal Manometry:** Shows **failure of the Rectoanal Inhibitory Reflex (RAIR)**; it is a sensitive screening tool but not the gold standard. * **Definitive Treatment:** Surgical pull-through procedures (e.g., Duhamel, Soave, or Swenson).

Q: What fluid is used for rectal washouts in Hirschsprung's disease?

Normal saline. **Explanation:** In Hirschsprung’s disease, the primary goal of rectal washouts is to decompress the dilated proximal colon and prevent enterocolitis. **Normal Saline (0.9% NaCl)** is the fluid of choice because it is **isotonic** to human plasma. Since the aganglionic segment often requires large volumes of fluid for effective evacuation, using an isotonic solution prevents significant fluid and electrolyte shifts across the colonic mucosa. **Analysis of Incorrect Options:** * **Tap water (D) and 5% Dextrose (A):** These are **hypotonic** solutions. In a dilated colon (megacolon), there is a large surface area for absorption. Using hypotonic fluids leads to rapid water absorption into the bloodstream, which can cause **dilutional hyponatremia** and potentially fatal **water intoxication** (cerebral edema and seizures). * **Soap solution (C):** This is highly irritating to the colonic mucosa. It can cause chemical colitis and mucosal injury, making it contraindicated in pediatric patients, especially those already at risk for Hirschsprung-associated enterocolitis (HAEC). **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Full-thickness rectal biopsy (showing absence of ganglion cells in Meissner’s and Auerbach’s plexuses and presence of hypertrophied nerve bundles). * **Initial Management:** Rectal washouts are the "bridge" to definitive surgery, performed 2–3 times daily. * **Technique:** A large-bore catheter (16–22 Fr) is used; the volume should not exceed 20 ml/kg per cycle. * **Definitive Procedures:** Duhamel, Soave, and Swenson procedures are the classic surgical repairs.

Q: Chromosomal anomalies and cardiac anomalies are more frequently associated with which of the following congenital disorders?

Omphalocele. **Explanation:** **Omphalocele** is a midline abdominal wall defect where the bowel and/or solid viscera herniate through the umbilical ring, covered by a sac consisting of peritoneum and amnion. It is the correct answer because it is highly associated with extra-abdominal anomalies in **50–70% of cases**. * **Chromosomal Anomalies:** Approximately 30–50% of infants with omphalocele have chromosomal defects, most commonly **Trisomy 18 (Edwards syndrome)**, followed by Trisomy 13 and 21. * **Cardiac Anomalies:** Congenital heart disease (e.g., ASD, VSD, Tetralogy of Fallot) occurs in nearly 30–50% of these patients. It is also a key component of **Beckwith-Wiedemann Syndrome** (macroglossia, gigantism, hypoglycemia). **Why the other options are incorrect:** * **Gastroschisis:** This is a full-thickness paraumbilical defect (usually to the right) with no covering sac. Unlike omphalocele, it is typically an **isolated finding** and is rarely associated with chromosomal or cardiac anomalies. * **Spina Bifida:** While associated with neurological and orthopedic issues (and sometimes hydrocephalus), it is not primarily characterized by the high frequency of chromosomal/cardiac clusters seen in omphalocele. * **Cleft Palate:** While it can be part of syndromes (like Patau), isolated cleft palate has a much lower association with major systemic chromosomal/cardiac defects compared to omphalocele. **High-Yield Clinical Pearls for NEET-PG:** * **Maternal Age:** Gastroschisis is associated with *young* maternal age; Omphalocele is associated with *advanced* maternal age. * **AFP Levels:** Maternal Serum Alpha-Fetoprotein (MSAFP) is significantly higher in Gastroschisis than in Omphalocele (due to the exposed bowel). * **Management Rule:** In Omphalocele, always perform an **Echocardiogram** and **Karyotyping** before surgical repair.

Q: All of the following are seen in hypospadias except?

Ectopia vesicae. **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 Ectopia Vesicae is the correct answer:** Ectopia vesicae (bladder exstrophy) is a severe midline defect involving the failure of the infra-umbilical abdominal wall and anterior bladder wall to close. While it is associated with **epispadias** (urethral opening on the *dorsal* aspect), it is not a feature of hypospadias. These two conditions arise from different embryological failures. **Analysis of other options:** * **Hooded Prepuce:** This is a hallmark of hypospadias. Due to the failure of the ventral prepuce to develop, the dorsal foreskin becomes redundant and hangs over the glans like a "hood." * **Chordee:** This refers to the ventral curvature of the penis, often caused by a fibrous band of tissue or skin tethering. It is a classic component of the hypospadias triad. * **Infertility:** While not universal, hypospadias can lead to infertility due to the abnormal position of the meatus (causing failure of sperm deposition in the vaginal vault) or associated undescended testes (cryptorchidism). **High-Yield Clinical Pearls for NEET-PG:** * **The Hypospadias Triad:** 1. Ventral meatus, 2. Ventral chordee, 3. Hooded dorsal prepuce. * **Contraindication:** Circumcision is strictly contraindicated in these infants because the prepuce is required for future surgical reconstruction (urethroplasty). * **Commonest Site:** Glandular/Coronal (Distal). * **Associated Anomalies:** Cryptorchidism (10%) and Inguinal hernia. If a child has hypospadias and undescended testes, always screen for Disorders of Sex Development (DSD).

Q: Which of the following is true regarding rectal atresia?

The anus appears normal.. **Explanation:** **Rectal Atresia** is a rare and unique variant of anorectal malformations (ARMs). The hallmark of this condition is that the **anal canal is developed normally**, but there is a complete obstruction (atresia) in the rectum, usually 2–3 cm above the anal verge. 1. **Why Option A is correct:** In rectal atresia, the proctodeum (the part that forms the anus) develops normally. Therefore, on external inspection, the **anus appears normal** with a well-formed anal pit and a present anal wink reflex. The diagnosis is often delayed until the first attempt to take a rectal temperature or when the infant fails to pass meconium despite a normal-looking anus. 2. **Why the other options are incorrect:** * **Option B & D:** Rectal atresia is characterized by the **absence of a fistula** connecting to the urinary tract or perineum. Rectovesical fistulas are associated with "High" anorectal malformations (anorectal agenesis), not rectal atresia. * **Option C:** According to the Wingspread and Krickenbeck classifications, rectal atresia is classified as a **High/Intermediate type** of malformation, not a low type. **High-Yield Pearls for NEET-PG:** * **Clinical Presentation:** Failure to pass meconium + Normal looking anus + Resistance felt on inserting a catheter (usually at 2–3 cm). * **Radiology:** The "Invertogram" (Wangensteen-Rice view) is used to determine the level of the lesion in ARMs, but clinical examination is paramount. * **Management:** Unlike low ARMs (which require anoplasty), rectal atresia usually requires a **divided sigmoid colostomy** followed by a definitive pull-through procedure (like PSARP). * **Association:** It accounts for only 1–2% of all anorectal malformations.

Q: Which of the following is true of eventration of diaphragm?

Early surgery is the treatment. **Explanation:** **Eventration of the diaphragm** is a condition where the diaphragmatic muscle is replaced by thin, fibroelastic tissue, causing the diaphragm to be permanently elevated. **Why Option B is Correct:** Early surgical intervention (Diaphragmatic Plication) is the treatment of choice, especially in symptomatic patients or infants. Plication flattens the diaphragm, stabilizes the mediastinum, and allows the ipsilateral lung to expand, thereby improving ventilation-perfusion mismatch and respiratory mechanics. **Analysis of Incorrect Options:** * **Option A:** It is not a developmental "defect" (like a hole in CDH); rather, it is a **failure of muscularization**. It can be congenital (due to abnormal migration of myoblasts) or acquired (due to phrenic nerve injury). * **Option C:** The defect is **not muscular**. In eventration, the normal striated muscle is replaced by a thin, translucent **aponeurotic/fibrous sheet**. This distinguishes it from a hernia, where there is an actual breach in continuity. * **Option D:** It is **rarely diagnosed clinically**. Most cases are asymptomatic and discovered incidentally on a **Chest X-ray** (showing a smooth, elevated dome of the diaphragm). Definitive diagnosis often requires fluoroscopy (Sniff test) to observe paradoxical or diminished movement. **High-Yield Pearls for NEET-PG:** * **Sniff Test (Fluoroscopy):** The gold standard for assessing diaphragmatic motion. In eventration, the affected side shows paradoxical upward movement during inspiration. * **Most Common Site:** Usually involves the **left** side (unlike traumatic ruptures which also favor the left). * **Differential Diagnosis:** Must be differentiated from **Congenital Diaphragmatic Hernia (CDH)**. In eventration, the pleural and peritoneal sacs remain intact and separated by the fibrous sheet.

Q: A newborn male is brought by parents with imperforate anus. After ruling out associated abnormalities, an inverseogram was performed, and rectal gas was found to be below the coccyx. What is the preferred treatment for this child?

Posterior Sagittal Anorectal Plasty (PSARP). **Explanation:** The management of Anorectal Malformations (ARM) is determined by the level of the rectal pouch relative to the pelvic floor muscles. **1. Why PSARP is correct:** The **Invertogram** (Wangensteen-Rice view) is used to classify the defect. When the rectal gas shadow is **below the coccyx** (or <1 cm from the perineal skin), it indicates a **"Low" Anorectal Malformation**. In males, low defects typically present as a cutaneous fistula or a covered anus. The definitive treatment for a low ARM is a primary **Posterior Sagittal Anorectal Plasty (PSARP)** or a simple perineal repair, performed without a diverting colostomy. **2. Why other options are incorrect:** * **Observation (A):** Imperforate anus is a surgical emergency (potential for intestinal obstruction); observation is never appropriate. * **Anoplasty (B):** While often used for very simple perineal fistulas, PSARP is the standardized, preferred surgical approach to ensure the rectum is correctly positioned within the muscle complex. * **Colostomy (D):** A staged approach (Colostomy → PSARP → Closure) is reserved for **"High" or "Intermediate" defects** (gas shadow above the coccyx or >1 cm from the skin) to prevent fecal contamination of the urinary tract or when associated with complex fistulas. **Clinical Pearls for NEET-PG:** * **Timing:** Invertograms should only be performed **after 18–24 hours** of life to allow bowel gas to reach the distal rectum. * **VACTERL Association:** Always screen for Vertebral, Anal, Cardiac, Tracheo-Esophageal, Renal, and Limb anomalies. * **Initial Investigation:** The first step in a newborn with ARM is a thorough **perineal examination** and a **cross-table lateral film** in the prone position. * **Gold Standard:** Alberto Peña’s PSARP is the gold standard for most ARMs.

Q: True regarding cystic hygroma is:

Brilliantly translucent. **Explanation:** **Cystic Hygroma** (also known as macrocystic lymphatic malformation) is a congenital malformation of the lymphatic system, resulting from the failure of lymphatics to connect with the venous system. 1. **Why Option B is correct:** Cystic hygromas are thin-walled, multiloculated cysts filled with clear, straw-colored lymph fluid. Because they contain clear fluid and lack a solid component or thick capsule, they are **brilliantly translucent** when a light source is applied (transillumination test). This is a classic clinical sign used to differentiate them from other neck masses like hemangiomas or teratomas. 2. **Why other options are incorrect:** * **Option A:** While most commonly found in the posterior triangle of the neck, they can be bilateral or extend across the midline. * **Option C:** Unlike strawberry hemangiomas, cystic hygromas **do not spontaneously regress**. They typically grow in proportion to the child and require intervention (sclerotherapy or surgical excision) if they cause functional impairment or cosmetic deformity. * **Option D:** Although 50–60% are present at birth, about 90% manifest by age two. They can appear later in life following trauma or infection. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Left side of the neck (Posterior triangle). * **Association:** Frequently associated with chromosomal anomalies, most notably **Turner Syndrome (45, XO)** and Down Syndrome. * **Complications:** Sudden increase in size usually indicates **intracystic hemorrhage** or infection. * **Management:** **Sclerotherapy** (e.g., OK-432, Bleomycin) is often the first-line treatment for macrocystic lesions; surgical excision is reserved for cases where sclerotherapy fails.

Question 1

The diagnosis of congenital megacolon is confirmed by:

Accepted Answer

Rectal biopsy

Answer

Clinical features

Answer

Barium enema

Answer

Recto-sigmoidoscopy

Question 2

Which of the following conditions cannot be prevented by orchiopexy in cryptorchidism?

Accepted Answer

Testicular tumor

Answer

Epididymo-orchitis

Answer

Torsion of the testis

Answer

Sexual ambiguity

Question 3

What fluid is used for rectal washouts in Hirschsprung's disease?

Accepted Answer

Normal saline

Answer

5% dextrose

Answer

Soap solution

Answer

Tap water

Question 4

Chromosomal anomalies and cardiac anomalies are more frequently associated with which of the following congenital disorders?

Accepted Answer

Omphalocele

Answer

Gastroschisis

Answer

Spina Bifida

Answer

Cleft Palate

Question 5

A child underwent splenectomy for splenic injury and blood loss following trauma. What is the recommended further management, considering all EXCEPT which of the following?

Accepted Answer

Continue aspirin to prevent coagulation

Answer

Continuous penicillin treatment

Answer

The parents are advised of the possible complications the child is prone for

Answer

Repeated evaluation for potential complications

Question 6

All of the following are seen in hypospadias except?

Accepted Answer

Ectopia vesicae

Answer

Hooded prepuce

Answer

Chordee

Answer

Infertility

Question 7

Which of the following is true regarding rectal atresia?

Accepted Answer

The anus appears normal.

Answer

A rectovesical fistula is present.

Answer

It is a low type of anorectal malformation.

Answer

Rectovesical fistula is most common in males.

Question 8

Which of the following is true of eventration of diaphragm?

Accepted Answer

Early surgery is the treatment

Answer

It is a developmental defect

Answer

The defect is usually muscular

Answer

It is diagnosed mostly clinically

Question 9

A newborn male is brought by parents with imperforate anus. After ruling out associated abnormalities, an inverseogram was performed, and rectal gas was found to be below the coccyx. What is the preferred treatment for this child?

Accepted Answer

Posterior Sagittal Anorectal Plasty (PSARP)

Answer

Observation

Answer

Anoplasty

Answer

Colostomy

Question 10

True regarding cystic hygroma is:

Accepted Answer

Brilliantly translucent

Answer

Always unilateral

Answer

Subsides by itself

Answer

Always presents at birth

Pediatric Surgery — MCQs

Pediatric Surgery — MCQs

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