Pediatric Surgery — MCQs

A 4-month-old infant has undergone surgical treatment for meningomyeloencephalocele. An operation was carried out in the posterior cranial fossa to partially replace cerebellar contents to an intracranial position. In investigations for progressive hydrocephalus, it is noted that there is herniation of the cerebellar tonsils through the foramen magnum, and a diagnosis of Arnold-Chiari syndrome is established. This syndrome may also include which of the following?

Q236Easy

What is the most common type of diaphragmatic hernia in children?

Q237Easy

Bochdalek hernia is related to which of the following structures?

Q238Easy

Which of the following is NOT a feature of Beckwith-Wiedemann syndrome?

Q239Easy

What is the cause of Coxa vera?

Q240Easy

Potter syndrome is not associated with which of the following conditions?

Pediatric Surgery Indian Medical PG Practice Questions and MCQs

Question 231: What is the incidence of undescended testis in term infants?

A. <5% (Correct Answer)
B. <1%
C. 8%
D. 10%

Explanation: **Explanation:** The descent of the testis into the scrotum is a complex process occurring in two phases: the transabdominal phase (7–15 weeks) and the inguinoscrotal phase (25–35 weeks). Because the final descent occurs late in the third trimester, the incidence of undescended testis (UDT) is highly dependent on gestational age. **1. Why Option A is correct:** In **full-term infants**, the incidence of undescended testis is approximately **3% to 4%** (fitting the **<5%** category). It is important to note that spontaneous descent often occurs during the first few months of life, particularly in the first 3 to 6 months, bringing the incidence down to about 1% by the age of one year. **2. Why the other options are incorrect:** * **Option B (<1%):** This represents the incidence of UDT in the general male population after the age of one year (post-spontaneous descent period). * **Options C & D (8% and 10%):** These values are too high for term infants. However, in **preterm infants**, the incidence is significantly higher, ranging from **20% to 30%**, as they are born before the inguinoscrotal phase of descent is complete. **Clinical Pearls for NEET-PG:** * **Most common site:** The most common location for an undescended testis is the **inguinal canal**. * **Spontaneous Descent:** If the testis does not descend by **6 months** of age, spontaneous descent is unlikely. * **Management:** The current gold standard is **Orchidopexy**, ideally performed between **6 to 12 months** of age to preserve fertility and allow for early detection of testicular cancer. * **Complications:** UDT increases the risk of infertility, inguinal hernia, testicular torsion, and **testicular germ cell tumors** (most commonly seminoma). Note that orchidopexy reduces the risk of malignancy but does not eliminate it.

Question 232: Millard's 'Rule of Ten' includes all except?

A. 10 lbs
B. 10 weeks
C. 10 gm % Hemoglobin
D. 10 months (Correct Answer)

Explanation: The **Rule of Ten**, formulated by **Wilhelmsen and Musgrave** (and popularized by **Ralph Millard**), defines the minimum clinical criteria required to safely perform a **Cleft Lip repair** (Cheiloplasty). The primary goal of these criteria is to ensure the infant is physiologically mature enough to tolerate general anesthesia and has adequate healing capacity. ### **Explanation of Options:** * **10 months (Correct Answer):** This is **not** part of the rule. Cleft lip repair is typically performed much earlier, around **10 weeks** of age. Waiting until 10 months would unnecessarily delay surgery and potentially interfere with early feeding and parental bonding. * **10 lbs (Option A):** The infant should weigh at least 10 pounds (approx. 4.5 kg). This ensures adequate nutritional status and body mass for surgical stress. * **10 weeks (Option B):** The infant should be at least 10 weeks old. This allows for the maturation of the hepatic and renal systems, reducing anesthetic risk. * **10 gm % Hemoglobin (Option C):** A minimum hemoglobin of 10 g/dL is required to ensure adequate oxygen-carrying capacity during and after the procedure. ### **High-Yield Clinical Pearls for NEET-PG:** * **Cleft Lip vs. Cleft Palate:** While the Rule of Ten applies to Cleft Lip (10 weeks), **Cleft Palate** repair (Palatoplasty) is usually performed later, between **6 to 12 months** (before the child starts speaking) to prevent speech defects. * **WBC Count:** Some versions of the rule also include a **WBC count < 10,000/mm³** to ensure there is no active infection. * **Most Common Type:** Cleft lip is more common on the **left side** and in **males**, whereas isolated cleft palate is more common in **females**.

Question 233: Cystic hygroma may be associated with which of the following?

A. Turner's syndrome
B. Klinefelter's syndrome
C. Down's syndrome
D. All of the above (Correct Answer)

Explanation: **Explanation:** **Cystic Hygroma** (also known as macrocystic lymphatic malformation) is a congenital malformation of the lymphatic system. It occurs due to the failure of the jugular lymph sacs to communicate with the internal jugular vein, leading to the sequestration of lymphatic tissue and subsequent cystic dilatation. **Why "All of the Above" is correct:** Cystic hygromas are frequently associated with chromosomal aneuploidies. While they are most classically linked to **Turner’s syndrome (45, XO)**, where they often present as fetal hydrops or nuchal translucency, they are also significantly associated with other trisomies and sex chromosome abnormalities: * **Turner’s Syndrome:** The most common association (up to 80% of fetuses with cystic hygroma). * **Down’s Syndrome (Trisomy 21):** A frequent association found during prenatal screening. * **Klinefelter’s Syndrome (47, XXY):** Though less common than Turner’s, it is a documented association in literature. * **Other associations:** Edward’s syndrome (Trisomy 18) and Patau syndrome (Trisomy 13). **Clinical Pearls for NEET-PG:** * **Most common site:** Posterior triangle of the neck (Left side > Right side). * **Clinical Feature:** It is a soft, painless, compressible, and **brilliantly transilluminant** swelling. * **Complications:** Sudden increase in size due to hemorrhage or infection; respiratory distress if it compresses the airway. * **Treatment of choice:** Surgical excision is the gold standard. For unresectable cases or as an adjunct, sclerotherapy (using **OK-432/Picibanil** or Bleomycin) is used. * **Note:** It is not a true neoplasm but a malformation; however, it can infiltrate tissue planes, making complete surgical removal challenging.

Question 234: Sacrococcygeal teratoma is associated with which of the following?

A. Meningocele (Correct Answer)
B. Cardiac defects
C. Hepatic cysts
D. Cystic adenoid malformation

Explanation: **Explanation:** Sacrococcygeal Teratoma (SCT) is the most common newborn tumor, arising from the **totipotent cells of Hensen’s node** (primitive streak). The correct association is **Meningocele** (Option A) because both SCT and neural tube defects occur due to developmental anomalies at the caudal end of the embryo. Specifically, SCT is a key component of the **Currarino Triad**, which consists of: 1. Anorectal malformation (usually anal stenosis) 2. Sacral bony abnormality (scimitar sacrum) 3. Presacral mass (teratoma, meningocele, or enteric cyst) **Analysis of Incorrect Options:** * **B, C, and D:** While SCT can be associated with other anomalies in about 10-15% of cases (such as imperforate anus or urinary tract abnormalities), there is no established or high-yield syndromic association with cardiac defects, hepatic cysts, or congenital cystic adenomatoid malformation (CCAM). **High-Yield Clinical Pearls for NEET-PG:** * **Epidemiology:** Most common in females (4:1 ratio), but malignancy is more common in males. * **Altman Classification:** * **Type I:** Predominantly external (most common). * **Type IV:** Entirely internal/presacral (highest risk of malignancy due to delayed diagnosis). * **Diagnosis:** Elevated **Alpha-fetoprotein (AFP)** is a marker for yolk sac components (malignancy) and is used for post-operative monitoring. * **Surgical Management:** Complete excision of the tumor **along with the coccyx** is mandatory to prevent recurrence. * **Complication:** Large tumors can cause "Maternal Mirror Syndrome" or fetal hydrops due to high-output cardiac failure (vascular steal).

Question 235: A 4-month-old infant has undergone surgical treatment for meningomyeloencephalocele. An operation was carried out in the posterior cranial fossa to partially replace cerebellar contents to an intracranial position. In investigations for progressive hydrocephalus, it is noted that there is herniation of the cerebellar tonsils through the foramen magnum, and a diagnosis of Arnold-Chiari syndrome is established. This syndrome may also include which of the following?

A. Fusion of the frontal lobes
B. Fusion of the temporal, parietal, and occipital lobes
C. Abnormal elongation of the medulla and lower cranial nerves (Correct Answer)
D. Partial or complete absence of the pituitary gland

Explanation: ### Explanation **Arnold-Chiari Malformation (Type II)** is a congenital anomaly characterized by the downward displacement of the cerebellum and brainstem through the foramen magnum. It is almost always associated with a **myelomeningocele**. #### Why Option C is Correct: In Chiari Type II malformation, the posterior fossa is abnormally small. This leads to the **herniation of the cerebellar tonsils, vermis, and the medulla oblongata** through the foramen magnum into the spinal canal. Consequently, the **medulla and lower cranial nerves (IX, X, XI, XII) become abnormally elongated** and stretched as they travel upward to exit their respective foramina. This stretching can lead to symptoms like stridor, swallowing difficulties, and apnea in infants. #### Why Other Options are Incorrect: * **Options A & B (Fusion of lobes):** These are features of **Holoprosencephaly**, a defect in the primary prosencephalic cleavage, not a posterior fossa defect. * **Option D (Absence of pituitary):** This is associated with **Septo-optic dysplasia** or panhypopituitarism, which is unrelated to the structural hindbrain herniation seen in Chiari malformations. #### NEET-PG High-Yield Pearls: * **Chiari Type I:** Downward displacement of cerebellar tonsils only (>5mm); often asymptomatic until adulthood; associated with **syringomyelia**. * **Chiari Type II:** Displacement of tonsils, vermis, and medulla; associated with **lumbar myelomeningocele** and **hydrocephalus** (due to aqueductal stenosis). * **Radiological Sign:** "Beaked midbrain" (tectal plate deformity) and "Banana sign" (curved cerebellum) on prenatal ultrasound. * **Management:** Ventriculoperitoneal (VP) shunting for hydrocephalus and posterior fossa decompression if symptomatic.

Question 236: What is the most common type of diaphragmatic hernia in children?

A. Through the foramen of Bochdalek (Correct Answer)
B. Through the foramen of Morgagni
C. Traumatic rupture of the diaphragm
D. Eventration of the diaphragm

Explanation: **Explanation:** Congenital Diaphragmatic Hernia (CDH) is a critical surgical emergency in neonates. The correct answer is **Option A: Foramen of Bochdalek**, which accounts for approximately **85-90%** of all CDH cases. **1. Why Bochdalek is correct:** This hernia occurs due to the failure of the **pleuroperitoneal membranes** to fuse with the septum transversum and dorsal mesentery of the esophagus during the 8th to 10th week of gestation. It is most commonly located **posterolaterally** and occurs on the **left side (80-85%)** because the left pleuroperitoneal canal closes later than the right, and the liver provides a protective barrier on the right side. **2. Why other options are incorrect:** * **Foramen of Morgagni:** This is an anterior (retrosternal) defect. It is much rarer (approx. 2-5%) and often remains asymptomatic until later in childhood or adulthood. * **Traumatic Rupture:** This is an acquired condition resulting from blunt or penetrating chest/abdominal trauma. While serious, it is not the most common type in the pediatric population. * **Eventration:** This is not a true hernia but a thinning (elevation) of the diaphragmatic muscle due to incomplete muscularization. The diaphragm remains intact, but its paradoxical movement causes respiratory distress. **Clinical Pearls for NEET-PG:** * **Triad of CDH:** Respiratory distress, Scaphoid abdomen, and Dextrocardia (due to mediastinal shift). * **Prognostic Factor:** The primary cause of mortality is **Pulmonary Hypoplasia** and persistent pulmonary hypertension, not the defect itself. * **Management:** Immediate stabilization involves **intubation (avoid bag-and-mask ventilation)** and NG tube decompression. Surgery is never an emergency; it is performed only after the neonate is hemodynamically stable.

Question 237: Bochdalek hernia is related to which of the following structures?

A. Inguinal canal
B. Pleuroperitoneal canal (Correct Answer)
C. Femoral canal
D. Obturator foramen

Explanation: **Explanation:** **Bochdalek hernia** is the most common type of congenital diaphragmatic hernia (CDH), accounting for approximately 85–90% of cases. It results from the **failure of the pleuroperitoneal canal to close** during embryonic development (usually between the 8th and 10th week of gestation). This canal normally connects the pleural and peritoneal cavities; its failure to fuse leads to a posterolateral defect in the diaphragm, allowing abdominal viscera to herniate into the thoracic cavity. It occurs more frequently on the **left side** (80%) because the left pleuroperitoneal canal closes later than the right, and the liver provides a protective barrier on the right. **Analysis of Incorrect Options:** * **A. Inguinal canal:** This is the site for inguinal hernias (indirect/direct), which are caused by a patent processus vaginalis or weak transversalis fascia, not diaphragmatic defects. * **C. Femoral canal:** This is the site for femoral hernias, located below the inguinal ligament, medial to the femoral vein. * **D. Obturator foramen:** This is the site for obturator hernias, which typically present in elderly, thin women (Howship-Romberg sign). **High-Yield Clinical Pearls for NEET-PG:** * **Triad of CDH:** Dyspnea, Cyanosis, and Dextrocardia (due to mediastinal shift). * **Physical Exam:** Scaphoid abdomen and absent breath sounds on the affected side with audible bowel sounds in the chest. * **Most Important Prognostic Factor:** Pulmonary hypoplasia and persistent pulmonary hypertension (PPHN). * **Management:** It is a **medical, not surgical, emergency**. Initial stabilization involves lung-protective ventilation (avoiding bag-mask ventilation to prevent bowel distension) followed by delayed surgical repair.

Question 238: Which of the following is NOT a feature of Beckwith-Wiedemann syndrome?

A. Omphalocele
B. Macrosomia
C. Hyperglycemia (Correct Answer)
D. Visceromegaly

Explanation: **Explanation:** Beckwith-Wiedemann Syndrome (BWS) is a classic **overgrowth disorder** caused by mutations or epigenetic changes on chromosome **11p15.5**, involving genes like *IGF2* and *CDKN1C*. **Why Hyperglycemia is the Correct Answer:** Patients with BWS characteristically present with **Hypoglycemia**, not hyperglycemia. This occurs due to **pancreatic islet cell hyperplasia**, leading to hyperinsulinism. This neonatal hypoglycemia can be severe and persistent, requiring prompt management to prevent neurological damage. **Analysis of Incorrect Options:** * **Omphalocele (A):** This is a hallmark midline abdominal wall defect seen in BWS. Other umbilical abnormalities, such as umbilical hernia or diastasis recti, may also occur. * **Macrosomia (B):** BWS is defined by somatic overgrowth. Infants are often large for gestational age (birth weight >90th percentile) and may exhibit hemihyperplasia (asymmetric overgrowth of one side of the body). * **Visceromegaly (D):** Generalized enlargement of internal organs is common, particularly involving the liver (hepatomegaly), kidneys (nephromegaly), and tongue (**Macroglossia**). **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic (Ex-Om-Ma):** **Ex**ophthalmos, **Om**phalocele, **Ma**croglossia. * **Tumor Risk:** BWS carries a significantly increased risk (approx. 10%) of embryonal tumors. The most common are **Wilms tumor** and **Hepatoblastoma**. * **Screening Protocol:** Due to tumor risk, these children require abdominal ultrasounds every 3 months until age 8 and serum Alpha-fetoprotein (AFP) monitoring for hepatoblastoma. * **Ear Findings:** Look for characteristic **earlobe creases** and posterior helical pits.

Question 239: What is the cause of Coxa vera?

A. Congenital abnormalities (Correct Answer)
B. Paget's disease of bone
C. Slipped capital femoral epiphysis (SCFE)
D. All of the above

Explanation: **Explanation:** **Coxa Vara** is a clinical deformity of the hip where the angle between the head and the shaft of the femur (neck-shaft angle) is reduced to **less than 120 degrees** (normal is 125–135 degrees). **Why Option A is Correct:** While Coxa vara can be acquired, **Congenital Coxa Vara (Developmental)** is a specific clinical entity caused by a primary defect in endochondral ossification of the medial part of the femoral neck. It is often bilateral and presents when the child starts walking with a painless "waddling gait" and a positive Trendelenburg sign. In the context of standard surgical textbooks (like Bailey & Love), congenital/developmental causes are highlighted as the primary idiopathic etiology. **Why Options B and C are Incorrect:** * **Paget’s Disease (B):** While Paget’s can cause softening of the bone leading to a "shepherd’s crook" deformity, it is an extremely rare cause of Coxa vara in the pediatric population. * **SCFE (C):** Slipped Capital Femoral Epiphysis involves the displacement of the femoral head; while it changes the hip geometry, it is classified as a distinct epiphyseal pathology rather than the primary cause of Coxa vara itself. * **Option D:** Since the question specifically targets the "cause" in a pediatric surgery context, the congenital/developmental origin is the most definitive answer. **High-Yield Clinical Pearls for NEET-PG:** * **Radiological Hallmark:** Look for **Fairbank’s Triangle** (an inverted V-shaped translucent area in the lower part of the femoral neck). * **Clinical Sign:** Shortening of the limb and limited **abduction and internal rotation**. * **Treatment:** Indicated if the neck-shaft angle is <90° or if the deformity is progressive. The procedure of choice is **Pauwel’s intertrochanteric valgus osteotomy**.

Question 240: Potter syndrome is not associated with which of the following conditions?

A. Bilateral renal agenesis (Correct Answer)
B. Bilateral multicystic kidney disease
C. Oligohydramnios
D. Polyhydramnios

Explanation: **Explanation:** Potter syndrome (or Potter sequence) is a clinical cascade initiated by a lack of amniotic fluid (**Oligohydramnios**). The fundamental concept is that fetal urine is the primary source of amniotic fluid in the second half of pregnancy. Any condition that leads to fetal anuria or severe oliguria results in the characteristic physical findings of Potter syndrome. **Why Option D is the Correct Answer:** **Polyhydramnios** (excess amniotic fluid) is the opposite of the physiological state required for Potter syndrome. Potter sequence is strictly associated with **Oligohydramnios**. Therefore, Polyhydramnios is not associated with this condition. **Analysis of Other Options:** * **Oligohydramnios (Option C):** This is the "common pathway" for all features of Potter syndrome. The lack of fluid leads to uterine wall pressure on the fetus, causing limb deformities, "Potter facies" (flattened nose, recessed chin, low-set ears), and pulmonary hypoplasia. * **Bilateral Renal Agenesis (Option A):** This is the most common and classic cause of Potter syndrome (Type I). Since both kidneys are absent, no urine is produced. * **Bilateral Multicystic Kidney Disease (Option B):** This (along with posterior urethral valves or bilateral renal dysplasia) causes severe urinary tract obstruction or dysfunction. If both kidneys are affected, it leads to oligohydramnios and subsequently Potter syndrome. **NEET-PG High-Yield Pearls:** * **The "POTTER" Mnemonic:** **P**ulmonary hypoplasia, **O**ligohydramnios, **T**wisted face (Potter facies), **T**wisted skin, **E**xtremity defects (clubfoot), **R**enal failure/agenesis. * **Most Common Cause of Death:** Pulmonary hypoplasia (the lungs fail to develop because they require amniotic fluid for expansion). * **Classification:** Potter sequence is classified into four types based on the underlying renal pathology (Type I: Agenesis; Type II: Dysplasia; Type III: Polycystic; Type IV: Obstructive).

Practice by Chapter

Neonatal Physiology

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Congenital Anomalies Overview

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Neonatal Intestinal Obstruction

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Necrotizing Enterocolitis

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Hirschsprung's Disease

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Anorectal Malformations

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Pediatric Hernias

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Pyloric Stenosis

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Biliary Atresia

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Pediatric Tumors

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Congenital Diaphragmatic Hernia

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Pediatric Trauma

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