Pediatric Surgery Basics Practice Questions

Q: A 3-year-old boy presents with a soft, anterior, midline cervical mass. The mass moves upward when the patient is asked to protrude his tongue. What is the most likely diagnosis?

Thyroglossal duct cyst. **Explanation:** The clinical presentation is classic for a **Thyroglossal Duct Cyst (TGDC)**. **Why Option A is correct:** The thyroid gland originates at the *foramen cecum* (base of the tongue) and descends to its adult position in the neck. A TGDC occurs when a segment of this descent tract fails to involute. * **Location:** It is the most common congenital midline neck mass. * **Pathognomonic Sign:** Because the duct is anatomically connected to the hyoid bone and the base of the tongue, the cyst **moves upward during tongue protrusion** and swallowing. **Why the other options are incorrect:** * **Option B & D:** Defects or fistulae of the 3rd or 6th pharyngeal arches typically present as lateral neck masses or internal sinus tracts (often associated with the pyriform sinus), not midline masses that move with the tongue. * **Option C:** A **Branchial Cyst** (specifically from the 2nd arch, the most common type) presents as a soft mass along the **anterior border of the sternocleidomastoid muscle** (lateral neck). It does not move with tongue protrusion. **High-Yield Clinical Pearls for NEET-PG:** * **Sistrunk Operation:** The definitive surgical treatment. It involves excision of the cyst, the entire tract, and the **central portion of the hyoid bone** to prevent recurrence. * **Ectopic Thyroid:** Always perform an ultrasound before surgery to ensure the cyst isn't the patient’s only functioning thyroid tissue. * **Complication:** If infected, it may rupture to form a thyroglossal fistula. * **Malignancy:** Though rare (<1%), the most common cancer arising in a TGDC is **Papillary Thyroid Carcinoma**.

Q: A 2-hour-old male infant was diagnosed in utero with polyhydramnios. He is vomiting stomach contents and bile, a condition that has continued for 2 days. Radiographic examination reveals a "double bubble" sign on ultrasound scan. The child cries consistently and is constantly hungry but has lost 300 g in weight. Which of the following conditions will most likely explain the symptoms?

Duodenal atresia. ### Explanation **Correct Answer: B. Duodenal atresia** **1. Why it is correct:** The clinical triad of **polyhydramnios** (due to inability to swallow/absorb amniotic fluid), **bilious vomiting** shortly after birth, and the pathognomonic **"double bubble" sign** on imaging is classic for duodenal atresia. The "double bubble" represents air in the dilated stomach and the proximal duodenum, with no distal gas. Since the obstruction is distal to the ampulla of Vater, the vomitus is typically bilious. The weight loss and hunger are expected consequences of complete intestinal obstruction. **2. Why the other options are incorrect:** * **A. Duodenal stenosis:** While it presents similarly, stenosis is a partial obstruction. It usually presents later in life (not at 2 hours) and often shows some distal gas on X-ray, unlike the complete obstruction seen here. * **C. Hypertrophied pyloric sphincter (IHPS):** This typically presents at **3–6 weeks** of age with **non-bilious** projectile vomiting. The "double bubble" sign is not seen; instead, a "string sign" or "olive-shaped mass" is characteristic. * **D. Atrophied gastric antrum:** This is not a standard clinical entity causing neonatal intestinal obstruction or the "double bubble" sign. **3. High-Yield Clinical Pearls for NEET-PG:** * **Association:** Approximately 30% of infants with duodenal atresia have **Down Syndrome (Trisomy 21)**. * **Embryology:** Caused by a failure of **recanalization** of the duodenum during the 8th–10th week of gestation. * **Management:** Initial management involves nasogastric decompression and IV fluids. The definitive surgical treatment is **Duodenoduodenostomy** (Diamond-shaped anastomosis). * **Differential for Double Bubble:** Duodenal atresia, Annular pancreas, and Malrotation with Midgut Volvulus (though volvulus is a surgical emergency requiring immediate Doppler USG).

Q: Gasless abdomen on X-ray is seen with what type of tracheo-esophageal fistula?

Esophageal atresia with proximal TEF. ### Explanation The presence or absence of bowel gas on an abdominal X-ray in cases of Esophageal Atresia (EA) depends entirely on whether there is a communication (fistula) between the **trachea** and the **distal esophagus**. **1. Why Option B is Correct:** In **Esophageal Atresia with Proximal TEF**, the upper segment of the esophagus connects to the trachea, but the lower (distal) segment is a blind pouch. Since there is no connection between the airway and the stomach, air cannot reach the gastrointestinal tract. This results in a **"Gasless Abdomen"** (scaphoid abdomen) on X-ray. This is a rare variant (approx. 1-2%). **2. Analysis of Incorrect Options:** * **Isolated TEF (H-type):** There is no atresia; the esophagus is continuous. Air easily passes from the trachea into the esophagus through the fistula, leading to excessive bowel gas. * **EA with Distal TEF (Type C):** This is the **most common type (85%)**. Air travels from the trachea through the distal fistula into the stomach, resulting in a **gas-filled abdomen**. * **EA with Double TEF:** Since there is a distal fistula present, air will enter the stomach, leading to bowel gas. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most Common Type:** EA with Distal TEF (Vogt-type IIIb / Gross-type C). * **Pure Esophageal Atresia (Type A):** Also presents with a **gasless abdomen** because there is no fistula at all. * **Clinical Presentation:** Excessive salivation, drooling, choking, and cyanosis upon the first feed. * **Diagnosis:** Inability to pass a firm orogastric catheter (coils in the upper pouch on X-ray). * **VACTERL Association:** Always screen for Vertebral, Anal, Cardiac, TEF, Renal, and Limb anomalies. The most common associated cardiac defect is VSD.

Q: A child is born with bilious vomiting and failure to thrive. Which of the following is true about this condition?

Associated with Down syndrome. The clinical presentation of **bilious vomiting** in a neonate is a surgical emergency until proven otherwise. In the context of the options provided, the diagnosis is **Duodenal Atresia**. ### **Explanation of the Correct Answer** **B. Associated with Down syndrome:** Duodenal atresia is the most common cause of neonatal intestinal obstruction. Approximately **30% of infants with duodenal atresia have Trisomy 21 (Down syndrome)**. The condition results from a failure of recanalization of the duodenum during the 8th–10th week of gestation. ### **Why the Other Options are Incorrect** * **A & C (Ramstedt’s Surgery & Olive-shaped mass):** These are classic features of **Infantile Hypertrophic Pyloric Stenosis (IHPS)**. IHPS presents with **non-bilious** projectile vomiting (as the obstruction is proximal to the ampulla of Vater) and typically appears at 3–6 weeks of age, not immediately at birth. * **D (Red currant jelly stools):** This is the hallmark clinical sign of **Intussusception**, caused by the sloughing of intestinal mucosa and blood. It usually presents in older infants (6–18 months) with intermittent colicky abdominal pain. ### **High-Yield Clinical Pearls for NEET-PG** * **Radiology:** The pathognomonic finding is the **"Double Bubble Sign"** on X-ray (air in the stomach and the proximal duodenum). * **Antenatal Clue:** Often associated with **maternal polyhydramnios** due to the fetus's inability to swallow and absorb amniotic fluid. * **Surgical Management:** The procedure of choice is **Duodenoduodenostomy** (Diamond-shaped anastomosis). * **Vomiting Rule:** Bilious vomiting = Obstruction distal to the ampulla of Vater; Non-bilious = Obstruction proximal to the ampulla.

Q: A newborn presents with dribbling of milk after feeds, respiratory distress, and frothing at the mouth. What is the most likely diagnosis?

Tracheoesophageal fistula. ### Explanation The clinical triad of **excessive salivation (frothing at the mouth)**, **choking/dribbling during feeds**, and **respiratory distress** in a newborn is the classic presentation of **Tracheoesophageal Fistula (TEF)**, usually associated with **Esophageal Atresia (EA)**. **1. Why Tracheoesophageal Fistula is correct:** In the most common type (Type C: EA with distal TEF), the esophagus ends in a blind pouch. Saliva and milk cannot pass into the stomach, leading to pooling in the upper pouch and subsequent **frothing** and **regurgitation**. Respiratory distress occurs due to either aspiration of saliva from the upper pouch or reflux of gastric acid into the lungs through the fistula connecting the trachea and the distal esophagus. **2. Why other options are incorrect:** * **Tetralogy of Fallot (TOF):** This is a cyanotic congenital heart disease. While it causes respiratory distress (tachypnea) and cyanosis ("Tet spells"), it does not cause frothing at the mouth or immediate dribbling of feeds. * **Respiratory Distress Syndrome (RDS):** Primarily seen in preterm infants due to surfactant deficiency. It presents with grunting, flaring, and retractions immediately after birth, but not with feeding-related regurgitation or excessive salivation. **3. Clinical Pearls for NEET-PG:** * **Most Common Type:** Type C (85%) – Esophageal Atresia with Distal TEF. * **Initial Diagnostic Step:** Attempt to pass a stiff, radio-opaque **nasogastric (NG) tube**; it will meet resistance and coil in the upper pouch (confirmed via X-ray). * **Associated Anomalies:** Always screen for **VACTERL** association (Vertebral, Anal, Cardiac, TEF, Renal, Limb anomalies). * **Antenatal Clue:** Maternal polyhydramnios (fetus cannot swallow amniotic fluid). * **Gas Pattern:** Presence of air in the stomach on X-ray indicates a distal fistula; a "gasless abdomen" indicates isolated Esophageal Atresia.

Q: What is the typical management of a cystic hygroma?

Surgical excision in early childhood. **Explanation:** **Cystic Hygroma** (also known as macrocystic lymphatic malformation) is a congenital malformation of the lymphatic system. It results from the failure of lymphatics to communicate with the venous system, leading to the formation of large, fluid-filled cysts. **Why Option B is Correct:** The definitive management is **surgical excision**, typically performed in early childhood (usually between 6 months to 2 years of age). Early intervention is preferred to prevent complications such as secondary infection, sudden hemorrhage into the cyst, or respiratory distress due to compression of the airway, especially in cervical lesions. If the lesion is infiltrative or involves vital structures, sclerotherapy (e.g., using OK-432 or Bleomycin) may be used as an alternative or adjunct. **Why Other Options are Incorrect:** * **Options A & C:** Unlike strawberry hemangiomas, cystic hygromas **do not undergo spontaneous regression**. They tend to grow progressively with the child and may enlarge rapidly during upper respiratory infections. * **Option D:** Most cystic hygromas (approx. 50-60%) are present at birth, and nearly **90% manifest by the age of 2 years**. Presentation in the second or third decade is rare. **High-Yield NEET-PG Pearls:** * **Most common site:** Posterior triangle of the neck (Left side > Right side). * **Clinical sign:** It is a soft, painless, compressible mass that **transilluminates brilliantly**. * **Association:** Often associated with chromosomal anomalies, most notably **Turner Syndrome** (45, XO) and Down Syndrome. * **Diagnosis:** Prenatal diagnosis is possible via USG (increased nuchal translucency). Postnatally, MRI is the gold standard to assess the extent of the lesion before surgery.

Q: Unilateral undescended testes is ideally operated around what age?

6 months of age. **Explanation:** The management of undescended testes (cryptorchidism) is centered on the timing of spontaneous descent and the prevention of long-term complications. **Why 6 months is the correct answer:** Spontaneous descent of the testes is common in the first few months of life, driven by the postnatal "mini-puberty" (surge in testosterone). However, it is clinically observed that if the testis has not descended by **6 months of age**, it is highly unlikely to do so spontaneously thereafter. Current international guidelines (AAP and AUA) recommend that surgical intervention (**Orchidopexy**) should be performed between **6 and 12 months of age**. Operating at 6 months minimizes the risk of germ cell loss, improves fertility potential, and allows for easier screening for testicular malignancy later in life. **Analysis of Incorrect Options:** * **A. 2 months:** Too early. Many testes will still descend spontaneously between 2 and 4 months of age. * **C. 12 months:** While orchidopexy is often performed between 6–12 months, the "ideal" starting point for intervention is 6 months to prevent histological changes (Leydig and Sertoli cell depletion) that begin as early as 1 year. * **D. 24 months:** This is outdated practice. Delaying surgery beyond 1 year significantly increases the risk of infertility and makes the surgical procedure more complex due to potential hernia development. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Inguinal canal. * **Most common complication:** Inguinal hernia (due to patent processus vaginalis). * **Risk of Malignancy:** Orchidopexy does *not* eliminate the risk of testicular cancer (most commonly **Seminoma**), but it makes the testis palpable for early detection. * **Hormonal Therapy:** Generally not recommended as first-line treatment due to low efficacy compared to surgery.

Q: What is the most common cause of pseudopancreatic cysts in children?

Traumatic pancreatitis. **Explanation:** **Traumatic pancreatitis** is the most common cause of pseudopancreatic cysts in children. Unlike adults, where chronic alcoholism and gallstones are the primary triggers, pediatric pseudocysts are predominantly associated with **blunt abdominal trauma**. The classic mechanism involves a "handlebar injury" (bicycle accidents) or a direct blow to the epigastrium, which compresses the pancreas against the vertebral column. This leads to ductal disruption, leakage of pancreatic enzymes, and the subsequent formation of a fluid collection walled off by granulation tissue (rather than an epithelial lining, hence "pseudo"). **Analysis of Incorrect Options:** * **Choledochal cyst (A):** While these are congenital dilatations of the biliary tree common in children, they are anatomical malformations of the bile duct, not a cause of pancreatic pseudocysts. * **Annular pancreas (B):** This is a congenital anomaly where pancreatic tissue encircles the duodenum. It typically presents with neonatal intestinal obstruction, not pseudocyst formation. * **Drug-induced pancreatitis (C):** Drugs (like Valproate or L-asparaginase) can cause acute pancreatitis in children, but they are statistically less frequent causes of pseudocysts compared to trauma. **Clinical Pearls for NEET-PG:** * **Definition:** A pseudocyst is a collection of pancreatic juice enclosed by a wall of fibrous or granulation tissue, occurring typically **4–6 weeks** after an episode of acute pancreatitis. * **Most common site of injury:** The **neck of the pancreas** (due to compression against the spine). * **Diagnosis:** Ultrasound is the initial screening tool; **CECT** is the gold standard for defining anatomy. * **Management:** Many pediatric pseudocysts resolve spontaneously. Intervention (internal drainage like cystogastrostomy) is indicated if the cyst is symptomatic, enlarging, or infected.

Q: Meconium peritonitis typically occurs when?

Before and after birth. **Explanation:** **Meconium Peritonitis** is a sterile, chemical inflammatory reaction resulting from intrauterine or neonatal bowel perforation. 1. **Why "Before and after birth" is correct:** The perforation usually occurs **in utero** (antenatally) due to bowel obstruction (e.g., meconium ileus, atresia, or volvulus). This leads to the leakage of sterile meconium into the peritoneal cavity, causing intense chemical inflammation and characteristic **intraperitoneal calcifications** visible on prenatal ultrasound or postnatal X-rays. However, the perforation can remain "open" or recur **immediately after birth** as the infant begins to swallow air and peristalsis increases, leading to pneumoperitoneum and acute surgical distress. Therefore, the process spans both the prenatal and early postnatal periods. 2. **Why other options are incorrect:** * **A & B:** Limiting the occurrence to "just before" or "just after" birth is incomplete. While the initial insult is often intrauterine, the clinical presentation and potential for ongoing leakage continue into the neonatal period. * **D:** Meconium peritonitis is a result of intrinsic bowel pathology (obstruction/ischemia), not external mechanical trauma during the birthing process. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Cause:** Meconium ileus (associated with **Cystic Fibrosis** in ~20-40% of cases). * **Pathognomonic Sign:** Scrotal or abdominal **calcifications** on X-ray. * **Types:** * *Fibroadhesive:* Intense reaction sealing the perforation. * *Cystic:* Encysted meconium (pseudocyst). * *Generalized:* Widespread inflammation with pneumoperitoneum. * **Diagnosis:** Prenatal ultrasound shows polyhydramnios, fetal ascites, and bright echogenic foci (calcifications).

Question 1

A 3-year-old boy presents with a soft, anterior, midline cervical mass. The mass moves upward when the patient is asked to protrude his tongue. What is the most likely diagnosis?

Accepted Answer

Thyroglossal duct cyst

Answer

Defect in sixth pharyngeal arch

Answer

Branchial cyst

Answer

Cystic fistula of the third pharyngeal arch

Question 2

A 2-hour-old male infant was diagnosed in utero with polyhydramnios. He is vomiting stomach contents and bile, a condition that has continued for 2 days. Radiographic examination reveals a "double bubble" sign on ultrasound scan. The child cries consistently and is constantly hungry but has lost 300 g in weight. Which of the following conditions will most likely explain the symptoms?

Accepted Answer

Duodenal atresia

Answer

Duodenal stenosis

Answer

Hypertrophied pyloric sphincter

Answer

Atrophied gastric antrum

Question 3

Gasless abdomen on X-ray is seen with what type of tracheo-esophageal fistula?

Accepted Answer

Esophageal atresia with proximal TEF

Answer

Isolated TEF

Answer

Esophageal atresia with distal TEF

Answer

Esophageal atresia with double TEF

Question 4

What is the standard treatment for a large hydrocele in an infant?

Accepted Answer

Herniotomy

Answer

Repeated aspirations

Answer

Ligation of the sac at the opening of the inguinal canal

Answer

Eversion of the sac

Question 5

A child is born with bilious vomiting and failure to thrive. Which of the following is true about this condition?

Accepted Answer

Associated with Down syndrome

Answer

Treatment is Ramsted's surgery

Answer

An olive-shaped mass is present

Answer

Red currant jelly stools

Question 6

A newborn presents with dribbling of milk after feeds, respiratory distress, and frothing at the mouth. What is the most likely diagnosis?

Accepted Answer

Tracheoesophageal fistula

Answer

Tetralogy of Fallot

Answer

Respiratory distress syndrome

Answer

None of the above

Question 7

What is the typical management of a cystic hygroma?

Accepted Answer

Surgical excision in early childhood

Answer

Observation without intervention

Answer

Expectation of spontaneous regression

Answer

Presentation typically in the second or third decade of life

Question 8

Unilateral undescended testes is ideally operated around what age?

Accepted Answer

6 months of age

Answer

2 months of age

Answer

12 months of age

Answer

24 months of age

Question 9

What is the most common cause of pseudopancreatic cysts in children?

Accepted Answer

Traumatic pancreatitis

Answer

Choledochal cyst

Answer

Annular pancreas

Answer

Drug-induced pancreatitis

Question 10

Meconium peritonitis typically occurs when?

Accepted Answer

Before and after birth

Answer

Just before birth

Answer

Just after birth

Answer

Due to birth trauma

Pediatric Surgery Basics — MCQs

Pediatric Surgery Basics — MCQs

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