Pediatric Surgery Practice Questions

Q: A 3-year-old child presents with a red scrotal swelling that resolves by the next morning, being maximal in the evening. The swelling shows a positive transillumination test. What is the most likely diagnosis?

Congenital hydrocele. **Explanation:** The clinical presentation of a scrotal swelling that fluctuates in size—specifically being **maximal in the evening** (after activity/gravity) and **resolving by morning** (after lying flat)—is the hallmark of a **Congenital (Communicating) Hydrocele**. **1. Why Congenital Hydrocele is correct:** This condition occurs due to a **patent processus vaginalis (PPV)**, which allows peritoneal fluid to flow into the scrotum. During the day, gravity and increased intra-abdominal pressure force fluid into the tunica vaginalis, causing swelling. At night, the fluid drains back into the peritoneal cavity, leading to resolution. The **positive transillumination test** confirms the presence of clear fluid. **2. Why other options are incorrect:** * **Scrotal/Secondary Abscess:** These are inflammatory conditions. They present with constant pain, fever, and erythema. The swelling would not resolve overnight and would be opaque (negative transillumination). * **Infantile Hydrocele:** In this type, the processus vaginalis is obliterated at the internal ring but remains patent below it. Because there is no communication with the peritoneal cavity, the swelling is **tense and constant** in size; it does not fluctuate with time of day or activity. **Clinical Pearls for NEET-PG:** * **Gold Standard Treatment:** Most congenital hydroceles are observed until age 1–2 as they may close spontaneously. If persistent, the treatment of choice is **High Ligation** of the sac (not Jaboulay’s procedure, which is for adult/primary hydrocele). * **Association:** A communicating hydrocele is essentially a precursor to an indirect inguinal hernia; the only difference is the width of the patent processus vaginalis. * **Transillumination:** Always positive in hydroceles (clear fluid) but negative in hernias (containing omentum/bowel) and hematoceles (blood).

Q: In a 3-year-old child, which of the following is the most common cyst located in the midline of the neck?

Thyroglossal cyst. **Explanation:** **1. Why Thyroglossal Cyst is Correct:** The **Thyroglossal Duct Cyst (TGDC)** is the most common congenital neck mass in children. It results from the failure of the thyroglossal duct to obliterate during the descent of the thyroid gland from the foramen cecum (base of tongue) to its final position in the neck. * **Location:** Characteristically found in the **midline** (80% of cases), most commonly at the level of the hyoid bone. * **Clinical Sign:** A pathognomonic feature is that the cyst **moves upward on protrusion of the tongue** (due to its attachment to the hyoid bone and foramen cecum) and on deglutition (swallowing). **2. Why Other Options are Incorrect:** * **Branchial Cyst:** These are remnants of the second branchial cleft. They are typically located **laterally**, along the anterior border of the upper third of the sternocleidomastoid muscle, not in the midline. * **Cystic Hygroma (Lymphangiocele):** These are congenital lymphatic malformations. While they can be large, they are most commonly found in the **posterior triangle** of the neck and are typically soft, painless, and brilliantly transilluminant. **3. NEET-PG High-Yield Pearls:** * **Surgical Management:** The treatment of choice is the **Sistrunk Operation**, which 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 is not the patient’s only functioning thyroid tissue. * **Most common site:** Subhyoid (most frequent), followed by suprahyoid and thyroid level. * **Complication:** If infected, it may rupture to form a thyroglossal fistula.

Q: What is true about cystic hygroma?

Congenital sequestration of lymphatics. ### Explanation **Cystic Hygroma** (also known as macrocystic lymphatic malformation) is a benign congenital malformation of the lymphatic system. **1. Why Option A is Correct:** The fundamental pathology of cystic hygroma is the **congenital sequestration of lymphatic tissue**. During embryogenesis, the primitive lymphatic sacs fail to communicate with the venous system. This leads to the sequestration (trapping) of lymphatic vessels, which subsequently undergo cystic dilatation as they fill with lymph, forming a multiloculated, fluid-filled mass. **2. Why Other Options are Incorrect:** * **Option B:** Unlike strawberry hemangiomas, cystic hygromas **do not resolve spontaneously**. They typically grow in proportion to the child and often require intervention (sclerotherapy or surgical excision) due to the risk of infection or compression of vital structures. * **Option C:** While they occur in the neck (75-80% of cases), they are most commonly found in the **posterior triangle** (lower one-third) of the lateral neck, rather than the upper one-third. **3. High-Yield Clinical Pearls for NEET-PG:** * **Transillumination:** Because they are fluid-filled, cystic hygromas are **brilliantly transilluminant**. * **Associations:** Frequently associated with chromosomal anomalies, most notably **Turner Syndrome (45, XO)** and Down Syndrome (Trisomy 21). * **Presentation:** Usually present at birth (60%) or by age 2 (90%). They are soft, painless, and compressible. * **Complications:** Sudden increase in size usually indicates **intracystic hemorrhage** or infection. * **Treatment of Choice:** **Sclerotherapy** (using agents like OK-432 or Bleomycin) is often the first-line treatment for macrocystic lesions; surgical excision is reserved for cases where sclerotherapy is ineffective or anatomically challenging.

Q: A 4-week-old first-born, preterm boy presented with projectile, non-bilious vomiting following each feeding. The infant remains hungry and eager to feed after vomiting. He is dehydrated, exhibits visible gastric peristaltic waves, and has a palpable olive-sized mass in the right upper quadrant. What is the surgery of choice?

Ramstedt's pyloromyotomy. ### Explanation The clinical presentation is a classic case of **Infantile Hypertrophic Pyloric Stenosis (IHPS)**. The diagnosis is confirmed by the triad of **projectile non-bilious vomiting**, visible gastric peristalsis, and a **palpable olive-shaped mass** (hypertrophied pylorus) in the right upper quadrant. #### Why Ramstedt’s Pyloromyotomy is Correct: The definitive treatment for IHPS is **Ramstedt’s pyloromyotomy**. In this procedure, a longitudinal incision is made through the serosa and the hypertrophied circular muscle fibers of the pylorus, extending down to (but not through) the submucosa. This allows the mucosa to bulge through the incision, relieving the gastric outlet obstruction. #### Why Other Options are Incorrect: * **Duodenostomy:** Used for conditions like duodenal atresia or webs, not for pyloric pathology. * **Billroth Type-I:** A partial gastrectomy with gastroduodenal anastomosis used for gastric cancer or complicated peptic ulcers; it is far too invasive and inappropriate for a neonate with IHPS. * **Kasai Operation (Hepatoportoenterostomy):** The surgical treatment for **Biliary Atresia**, which presents with conjugated jaundice and acholic stools, not projectile vomiting. #### High-Yield Clinical Pearls for NEET-PG: * **Metabolic Abnormality:** The classic finding is **Hypochloremic, hypokalemic, metabolic alkalosis** with **paradoxical aciduria**. * **Medical Emergency vs. Surgical Emergency:** IHPS is a **medical emergency**, not a surgical one. Rehydration and correction of electrolyte imbalances must occur *before* surgery. * **Epidemiology:** Most common in first-born males; associated with maternal **erythromycin/azithromycin** use. * **Imaging:** Ultrasound is the gold standard (Pyloric muscle thickness >4mm or length >14mm). On Barium swallow, look for the **"String sign"** or **"Beak sign."**

Q: Which is the most common complication of undescended testis?

Indirect inguinal hernia. **Explanation:** The correct answer is **Indirect inguinal hernia**. **Why it is the correct answer:** The descent of the testis is preceded by the **processus vaginalis**, a peritoneal fold. In cases of an undescended testis (cryptorchidism), the processus vaginalis almost always remains patent (fails to obliterate). This patent processus vaginalis provides a direct communication between the peritoneal cavity and the inguinal canal, leading to an **associated indirect inguinal hernia in approximately 90% of cases**. Therefore, it is statistically the most common complication/association. **Why the other options are incorrect:** * **Infertility:** While a significant long-term consequence (especially in bilateral cases), it is considered a **sequela** rather than the most common immediate anatomical complication. Histological changes start as early as 1–2 years of age. * **Torsion:** Undescended testes are more prone to torsion than scrotal testes due to increased mobility and lack of fixation, but the incidence is much lower than that of an associated hernia. * **Epididymo-orchitis:** This is an inflammatory/infectious condition and is not specifically linked to the malposition of the testis as a primary complication. **NEET-PG High-Yield Pearls:** * **Most common site:** Inguinal canal (specifically just outside the external ring). * **Malignancy Risk:** The risk of testicular germ cell tumors (most commonly **Seminoma**) is 4–10 times higher. Orchidopexy does not eliminate the risk but makes the testis accessible for screening. * **Optimal Age for Surgery:** Orchidopexy should ideally be performed between **6 to 12 months** of age to preserve fertility potential. * **Most common associated anomaly:** Patent processus vaginalis (leading to indirect hernia).

Q: H type tracheo-esophageal fistula occurs in what percentage of cases?

5%. Tracheoesophageal fistula (TEF) with or without esophageal atresia (EA) is a congenital anomaly resulting from the failure of the tracheoesophageal septum to divide the foregut into the trachea and esophagus. **Explanation of the Correct Answer:** **Option B (5%)** is correct. The **H-type fistula** (Gross Type E) is characterized by a fistula between the trachea and a continuous esophagus without atresia. It is relatively rare, accounting for approximately **4% to 5%** of all tracheoesophageal malformations. In this type, the fistula is usually located at a higher level (typically cervical or upper thoracic), making it distinct from the more common types associated with atresia. **Explanation of Incorrect Options:** * **Option A (<1%):** This frequency is too low. While rare, H-type is not as infrequent as Type B (isolated proximal fistula) or Type D (fistula at both ends), which occur in <1% of cases. * **Option C (8%) and D (12%):** These percentages overestimate the prevalence. The most common type (Type C: proximal atresia with distal fistula) accounts for ~85% of cases, leaving only a small percentage for the remaining types. **High-Yield Clinical Pearls for NEET-PG:** * **Vogt-Gross Classification:** The most common is **Type C** (85%), followed by **Type A** (Pure Esophageal Atresia, ~8%). * **Clinical Presentation of H-type:** Unlike other types, it presents later in infancy with the **"3 Cs"**: Coughing, Choking, and Cyanosis during feedings, along with recurrent pneumonia and abdominal distension (due to air entering the GI tract). * **Diagnosis:** The gold standard for H-type is a **Cine-esophagogram** (prone position) or bronchoscopy. * **VACTERL Association:** Always screen for vertebral, anal, cardiac, renal, and limb anomalies.

Q: Which of the following is a better prognostic factor for operation of biliary duct obstruction in a newborn?

Size of ductule > 200 micron. **Explanation:** The question refers to the surgical management of **Biliary Atresia (BA)**, specifically the **Kasai portoenterostomy**. The prognosis of this procedure depends heavily on the histological characteristics of the biliary remnants at the porta hepatis. **1. Why Option B is Correct:** The most significant histological predictor of successful bile drainage after a Kasai procedure is the **diameter of the biliary ductules** found within the fibrous tissue at the porta hepatis. According to the landmark studies by Chandra and Altman: * **Ductules > 200 microns:** Associated with the best prognosis and excellent bile flow. * **Ductules 150–200 microns:** Associated with fair prognosis. * **Ductules < 150 microns:** Associated with poor outcomes and failure of bile drainage. **2. Why Other Options are Incorrect:** * **Option A (No passage of bile):** This is a clinical sign of obstruction/failure, not a favorable prognostic factor. * **Option C & D (Weight/Preterm status):** While the general health and maturity of the baby affect surgical risk, they are not specific prognostic markers for the success of the biliary reconstruction itself. The **age at the time of surgery** is a much more critical factor than birth weight (ideally performed before 60 days of life). **High-Yield Clinical Pearls for NEET-PG:** * **Investigation of Choice:** HIDA scan (shows no excretion into the bowel). * **Gold Standard Diagnosis:** Intraoperative Cholangiogram (IOC). * **Kasai Procedure:** Also known as Hepatic Portoenterostomy. * **The "Rule of 8":** Success rates for Kasai are highest if performed before 8 weeks (60 days) of age. Beyond 90 days, the success rate drops significantly due to established secondary biliary cirrhosis. * **Most common cause** of pediatric liver transplantation is Biliary Atresia.

Q: A 5-year-old male child presents with a single testis in the scrotum. Examination reveals the contralateral testis is palpable in the inguinal canal. What is the recommended management?

Orchiopexy. **Explanation:** The clinical presentation describes **Undescended Testis (Cryptorchidism)**. In this case, the testis is palpable in the inguinal canal, confirming it is not absent but has failed to reach the scrotum. **1. Why Orchiopexy is correct:** Orchiopexy is the gold standard treatment for undescended testis. The primary goals are to preserve fertility (germ cell maturation begins at 6 months), reduce the risk of testicular torsion, and allow for easier screening for testicular malignancy (which is 40 times more common in undescended testes). Current guidelines recommend surgery between **6 to 12 months of age**. Since this child is 5 years old, immediate surgical intervention is mandatory to prevent further germ cell degradation. **2. Why other options are incorrect:** * **Observation until puberty:** Spontaneous descent is rare after 6 months of age. Delaying surgery until puberty significantly increases the risk of infertility and makes the detection of malignancy difficult. * **Orchidectomy:** This is reserved for cases where the testis is atrophic, non-viable, or if the patient is post-pubertal with a normal contralateral testis. In a 5-year-old, every effort is made to salvage the testis. * **Androgen administration:** Hormonal therapy (hCG or GnRH) has a very low success rate and is generally not recommended as a primary treatment, especially for palpable inguinal testes. **NEET-PG High-Yield Pearls:** * **Most common site:** Inguinal canal. * **Ideal age for surgery:** 6–12 months (latest by 18 months). * **Most common complication post-orchiopexy:** Testicular atrophy. * **Malignancy risk:** Orchiopexy does *not* eliminate the risk of malignancy but makes the testis accessible for examination. The most common tumor in an undescended testis is **Seminoma**. * **Investigation of choice:** Clinical examination is paramount. For non-palpable testes, **Diagnostic Laparoscopy** is the gold standard.

Q: What is the most commonly used shunt in the management of hydrocephalus?

Ventriculoperitoneal shunt. **Explanation:** The primary goal in treating hydrocephalus is to divert excess cerebrospinal fluid (CSF) from the cerebral ventricles to another body cavity where it can be absorbed. **Ventriculoperitoneal (VP) Shunt** is the most commonly used procedure because the peritoneum provides a large surface area for fluid absorption and can accommodate long lengths of tubing. This is particularly advantageous in pediatric patients, as the extra tubing allows for the child’s physical growth without requiring immediate surgical revision. It is technically simpler to perform and has a lower risk of life-threatening complications compared to vascular shunts. **Analysis of Incorrect Options:** * **Ventriculoatrial (VA) Shunt:** This was historically common but is now a second-line option. It carries risks of serious systemic complications, including endocarditis, "shunt nephritis" (immune-complex glomerulonephritis), and pulmonary hypertension. * **Ventriculopleural Shunt:** Used as a backup when the peritoneum is unsuitable (e.g., due to extensive adhesions). It is rarely used in children under age 7 because the pleural space has limited absorptive capacity, leading to symptomatic pleural effusion. * **Ventriculopericardial Shunt:** A very rare salvage procedure used only when other sites (peritoneum, atrium, pleura) are exhausted. **Clinical Pearls for NEET-PG:** * **Most common complication:** Shunt infection (most commonly *Staphylococcus epidermidis*). * **Most common cause of shunt failure:** Mechanical obstruction (usually at the proximal/ventricular end). * **Alternative:** Endoscopic Third Ventriculostomy (ETV) is the preferred treatment for obstructive (non-communicating) hydrocephalus to avoid shunt-related complications.

Question 1

A 3-year-old child presents with a red scrotal swelling that resolves by the next morning, being maximal in the evening. The swelling shows a positive transillumination test. What is the most likely diagnosis?

Accepted Answer

Congenital hydrocele

Answer

Scrotal abscess

Answer

Secondary abscess

Answer

Infantile hydrocele

Question 2

In a 3-year-old child, which of the following is the most common cyst located in the midline of the neck?

Accepted Answer

Thyroglossal cyst

Answer

Branchial cyst

Answer

Lymphangiocele

Answer

Cystic hygroma

Question 3

What is true about cystic hygroma?

Accepted Answer

Congenital sequestration of lymphatics

Answer

Resolves spontaneously by 5 years of age

Answer

Common in the upper one-third of the lateral neck

Answer

All of the above

Question 4

A 4-week-old first-born, preterm boy presented with projectile, non-bilious vomiting following each feeding. The infant remains hungry and eager to feed after vomiting. He is dehydrated, exhibits visible gastric peristaltic waves, and has a palpable olive-sized mass in the right upper quadrant. What is the surgery of choice?

Accepted Answer

Ramstedt's pyloromyotomy

Answer

Duodenostomy

Answer

Billroth Type-I gastrojejunostomy

Answer

Kasai operation

Question 5

Which is the most common complication of undescended testis?

Accepted Answer

Indirect inguinal hernia

Answer

Torsion

Answer

Infertility

Answer

Epididymo-orchitis

Question 6

H type tracheo-esophageal fistula occurs in what percentage of cases?

Accepted Answer

5%

Answer

Less than 1%

Answer

8%

Answer

12%

Question 7

Which of the following is a better prognostic factor for operation of biliary duct obstruction in a newborn?

Accepted Answer

Size of ductule > 200 micron

Answer

No passage of bile

Answer

Weight of baby > 3 kg

Answer

Preterm baby

Question 8

For an 8-year-old child with temporomandibular joint (TMJ) ankylosis, what is the treatment of choice?

Accepted Answer

Gap arthroplasty with costochondral grafting

Answer

Gap arthroplasty

Answer

Condylectomy

Answer

Treatment not required

Question 9

A 5-year-old male child presents with a single testis in the scrotum. Examination reveals the contralateral testis is palpable in the inguinal canal. What is the recommended management?

Accepted Answer

Orchiopexy

Answer

Observation until puberty

Answer

Orchidectomy

Answer

Androgen administration

Question 10

What is the most commonly used shunt in the management of hydrocephalus?

Accepted Answer

Ventriculoperitoneal shunt

Answer

Ventriculoatrial shunt

Answer

Ventriculopericardial shunt

Answer

Ventriculopleural shunt

Pediatric Surgery — MCQs

Pediatric Surgery — MCQs

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