Neonatology Practice Questions

Q: About trisomy 13, which of the following is a true statement?

Bilateral microphthalmia. **Explanation:** Trisomy 13, also known as **Patau Syndrome**, is a severe chromosomal anomaly characterized by a failure of midline development and defects in the prechordal mesoderm. **1. Why Option A is Correct:** Bilateral **microphthalmia** (abnormally small eyes) is a classic midline defect associated with Patau Syndrome. It often occurs alongside other ocular anomalies like coloboma or anophthalmia. The syndrome is defined by the "3 Ps": **P**olydactyly, **P**alates (Cleft lip/palate), and **P**unched-out scalp lesions (Aplasia cutis congenita). **2. Why the other options are incorrect:** * **Neurofibroma (B):** These are benign nerve sheath tumors characteristic of **Neurofibromatosis Type 1**, an autosomal dominant neurocutaneous syndrome, not a chromosomal trisomy. * **Rocker bottom feet (C):** While seen in Patau Syndrome, this is the **hallmark feature of Trisomy 18 (Edwards Syndrome)**. In NEET-PG, if forced to choose the most specific association, rocker bottom feet are classically linked to Edwards, whereas polydactyly is linked to Patau. * **Dermoid cyst (D):** These are developmental choristomas commonly found in the ovary or near the eyebrow. They are not a specific or diagnostic feature of Trisomy 13. **High-Yield Clinical Pearls for NEET-PG:** * **Holoprosencephaly:** The most severe neurological finding in Patau Syndrome (failure of the forebrain to divide). * **Aplasia Cutis Congenita:** Focal absence of skin on the scalp; a very high-yield "spotter" for Patau. * **Echogenic intracardiac focus:** Often seen on prenatal ultrasound. * **Prognosis:** Extremely poor; most infants do not survive beyond the first year of life.

Q: Which vitamin is administered to newborns to prevent hemorrhage?

Vitamin K. **Explanation:** **Correct Answer: A. Vitamin K** Newborns are naturally deficient in Vitamin K because it crosses the placenta poorly, and the neonatal gut is sterile (lacking the bacteria required for Vitamin K synthesis). Vitamin K is essential for the γ-carboxylation of clotting factors **II, VII, IX, and X**. Without it, infants are at high risk for **Vitamin K Deficiency Bleeding (VKDB)**, formerly known as Hemorrhagic Disease of the Newborn. To prevent this, a single intramuscular dose of 1 mg Vitamin K (Phytonadione) is routinely administered to all newborns within one hour of birth. **Incorrect Options:** * **Vitamin E:** While it is an antioxidant that prevents hemolysis in preterm infants, it does not play a direct role in the coagulation cascade. * **Vitamin D:** Essential for calcium homeostasis and bone health. Supplementation (400 IU/day) is recommended for breastfed infants to prevent rickets, but it does not prevent hemorrhage. * **Vitamin A:** Important for vision and immune function. Supplementation is part of the national immunization schedule starting at 9 months, not at birth for hemorrhage prevention. **High-Yield Clinical Pearls for NEET-PG:** * **VKDB Classification:** * *Early:* Within 24 hours (usually due to maternal drugs like anticonvulsants). * *Classic:* Days 2–7 (due to low intake/sterile gut). * *Late:* Weeks 2–12 (associated with exclusive breastfeeding or malabsorption). * **Route:** Intramuscular (IM) is preferred over oral due to better absorption and efficacy in preventing late VKDB. * **Dose:** 1 mg for infants >1500g; 0.5 mg for infants ≤1500g.

Q: What is the ponderal index in malnourished babies?

Less than 2. **Explanation:** The **Ponderal Index (PI)** is a critical anthropometric tool used to assess fetal and neonatal growth, particularly to differentiate between types of Intrauterine Growth Restriction (IUGR). It is calculated using the formula: **PI = [Weight (in grams) / Length (in cm)³] × 100** **Why Option B is Correct:** In healthy, term neonates, the normal Ponderal Index is typically between **2.2 and 3.0**. A value **less than 2** is the diagnostic cutoff for malnutrition or **Asymmetric IUGR** (wasted babies). In these cases, the baby’s weight is significantly reduced relative to their length because weight gain is affected in the third trimester while skeletal growth is relatively preserved (the "brain-sparing" effect). **Analysis of Incorrect Options:** * **Option A (<1):** This value is physiologically incompatible with life in a term neonate; even severely malnourished infants rarely fall below 1.5. * **Options C & D (<4 and <6):** These values are too high. A PI above 3.0 actually indicates a "short and fat" baby, often seen in infants of diabetic mothers (macrosomia). **NEET-PG High-Yield Pearls:** * **Asymmetric IUGR:** Low PI (<2). Caused by placental insufficiency (e.g., PIH). Better prognosis. * **Symmetric IUGR:** Normal PI (but low absolute weight/length). Caused by early insults like chromosomal anomalies or TORCH infections. * **Clinical Utility:** PI is more sensitive than weight-for-gestational-age alone in identifying neonates at risk for metabolic complications like hypoglycemia and hypothermia. * **Rule of Thumb:** If the baby looks "old man-like" with loose skin folds, the PI will almost certainly be <2.

Q: A premature baby born to a diabetic mother presented with respiratory distress and was admitted to the neonatal intensive care unit. Which of the following findings indicates Respiratory Distress Syndrome (RDS) in a newborn?

Presence of an air bronchogram on chest X-ray. **Explanation:** **Respiratory Distress Syndrome (RDS)**, also known as Hyaline Membrane Disease, is primarily caused by a deficiency of pulmonary surfactant, leading to alveolar collapse and decreased lung compliance. **Why Option C is Correct:** The hallmark radiological finding in RDS is a **"ground-glass appearance"** (diffuse reticulogranular opacities) with a prominent **air bronchogram**. An air bronchogram occurs when air-filled bronchi are visualized against the backdrop of collapsed (opaque) alveoli. This is a classic sign of parenchymal lung disease like RDS. **Why the Other Options are Incorrect:** * **Option A:** RDS typically presents **immediately at birth** or within the first few hours (usually <6 hours). A delayed onset often suggests other etiologies like pneumonia or sepsis. * **Option B:** Antenatal corticosteroids (e.g., Betamethasone) are a **preventive measure**. They accelerate fetal lung maturity and surfactant production, thereby *reducing* the risk and severity of RDS. * **Option D:** RDS is a disease of **prematurity**. While infants of diabetic mothers (IDM) are at higher risk due to insulin-mediated inhibition of surfactant synthesis, the risk is significantly higher in preterm babies. Term babies are more likely to present with Transient Tachypnea of the Newborn (TTN) or Meconium Aspiration Syndrome (MAS). **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Prematurity (most common), Maternal Diabetes, Cesarean section without labor, and Male gender. * **L/S Ratio:** A Lecithin/Sphingomyelin ratio of **<2:1** in amniotic fluid indicates lung immaturity. * **Management:** The definitive treatment is **Exogenous Surfactant replacement** (administered via ET tube) and respiratory support (CPAP or mechanical ventilation). * **Silverman-Anderson Score:** Used to grade the severity of respiratory distress in neonates (higher score = more severe distress).

Q: A boy presents with multiple bullous lesions on his trunk and periostitis observed on x-rays. What is the most appropriate next investigation?

VDRL testing for mother and child. ### Explanation The clinical presentation of **bullous lesions** (Pemphigus syphiliticus) and **periostitis** in an infant is highly suggestive of **Congenital Syphilis**. **1. Why Option A is Correct:** Congenital syphilis is caused by the transplacental transmission of *Treponema pallidum*. The classic early manifestations (appearing before age 2) include: * **Cutaneous signs:** Vesiculobullous lesions (often on palms and soles) or a maculopapular rash. * **Skeletal signs:** Periostitis (inflammation of the periosteum) and osteochondritis (e.g., Wimberger’s sign). The standard screening protocol involves non-treponemal tests like **VDRL or RPR**. Testing both the mother and the child is essential to correlate titers; a neonatal titer fourfold higher than the maternal titer is diagnostic. **2. Why Other Options are Incorrect:** * **Option B (PCR for TB):** While TB can cause osteomyelitis, it does not typically present with acute bullous lesions in neonates. * **Option C (HBsAg):** Hepatitis B in neonates is usually asymptomatic at birth and does not cause periostitis or bullous skin eruptions. * **Option D (ELISA):** While ELISA can be used for various infections (like HIV), VDRL remains the gold standard initial screening tool for syphilis due to its ability to monitor treatment response via titers. **Clinical Pearls for NEET-PG:** * **Snuffles:** Early-onset syphilitic rhinitis (highly infectious discharge). * **Wimberger’s Sign:** Focal erosion of the medial proximal tibial metaphysis. * **Hutchinson’s Triad (Late Syphilis):** Interstitial keratitis, sensorineural hearing loss, and Hutchinson teeth. * **Treatment of Choice:** Parenteral Penicillin G is the mainstay for both maternal and congenital syphilis.

Q: What are keratin-filled cysts commonly found along the midpalatine raphe of a newborn called?

Epstein pearl. ### Explanation **Correct Answer: A. Epstein pearl** **1. Why it is correct:** Epstein pearls are small (1–3 mm), firm, white-to-yellowish keratin-filled cysts found in approximately 60–85% of newborns. They are specifically located along the **midpalatine raphe** (the junction of the hard and soft palate). Pathophysiologically, they represent epithelial remnants trapped during the fusion of the palatal shelves. They are benign, asymptomatic, and typically resolve spontaneously within a few weeks of life without treatment. **2. Why the other options are incorrect:** * **B. Bohn’s nodules:** These are also keratin cysts but are found on the **buccal or lingual surfaces of the alveolar ridges** (away from the midline). They are remnants of minor salivary glands. * **C. Median palatine cyst:** This is a rare, larger developmental cyst of the palate. Unlike Epstein pearls, it is not a common transient finding in newborns and often requires clinical intervention. * **D. Eruption cyst:** These occur over the crown of an erupting tooth (usually deciduous) and appear as bluish, translucent fluctuant swellings on the alveolar ridge. **3. High-Yield Clinical Pearls for NEET-PG:** * **Location is Key:** Midline palate = Epstein pearls; Alveolar ridge = Bohn’s nodules. * **Management:** Reassurance only. No surgical intervention or "popping" is required as they exfoliate spontaneously. * **Differential:** Do not confuse these with **Milium** (small white papules on the nose/face) or **Milia** (keratin cysts on the skin). * **Prevalence:** They are more common in Caucasian infants compared to other ethnicities.

Q: What is the most common obstetrics nerve palsy observed in newborns?

Facial nerve. **Explanation:** The **Facial nerve (CN VII)** is the most common birth-related nerve palsy. This injury typically occurs due to compression of the nerve as it exits the stylomastoid foramen. The primary risk factors include **forceps-assisted delivery** (where the forceps blade exerts direct pressure on the nerve) and prolonged labor where the nerve is compressed against the maternal sacral promontory. Clinically, it presents as loss of the nasolabial fold, inability to close the eye, and the mouth drooping toward the unaffected side when the infant cries. Most cases are neuropraxic and resolve spontaneously within weeks. **Analysis of Incorrect Options:** * **Common Peroneal Nerve (C):** While this is the most common lower extremity palsy in adults (due to its superficial position at the fibular head), it is rare in neonates. It may occur due to intrauterine malposition or umbilical artery catheterization complications, but it is far less frequent than facial nerve injury. * **Tibial and Sural Nerves (A & B):** These nerves are deeply seated or located in protected areas. Isolated birth injuries to these nerves are extremely rare and are not characteristic of obstetric trauma. **High-Yield Clinical Pearls for NEET-PG:** * **Most common peripheral nerve injury:** Brachial plexus injury (Erb’s palsy is the most frequent subtype). * **Most common cranial nerve injury:** Facial nerve (CN VII). * **Differential Diagnosis:** Always distinguish traumatic facial palsy from **Möbius syndrome** (congenital aplasia of the 6th and 7th cranial nerve nuclei), which presents with bilateral involvement and inability to abduct the eyes. * **Management:** Most traumatic facial palsies require only supportive care (e.g., artificial tears to prevent corneal ulceration).

Q: What is the most common cause of an abdominal mass in neonates?

Multicystic dysplastic kidney. In neonatology, abdominal masses are frequently encountered, and the vast majority (approximately 55-60%) are of **renal origin**. **Why Multicystic Dysplastic Kidney (MCDK) is correct:** MCDK is the most common cause of a palpable abdominal mass in a newborn. It results from abnormal metanephric differentiation, leading to a non-functioning kidney replaced by multiple non-communicating cysts. While Hydronephrosis (often due to UPJ obstruction) is the most common cause of neonatal *neonatal renal enlargement* overall, MCDK is the most common *cystic* renal mass identified clinically. **Analysis of Incorrect Options:** * **A. Neuroblastoma:** This is the most common *malignant* abdominal tumor in neonates, but it is significantly less common than benign renal anomalies. * **C. Polycystic Kidney:** Autosomal Recessive Polycystic Kidney Disease (ARPKD) typically presents with bilateral, smooth, "giant" flank masses and is less common than the sporadic, often unilateral MCDK. * **D. Umbilical Hernia:** This is a defect in the abdominal wall, not an intra-abdominal mass. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of neonatal abdominal mass:** Renal anomalies (MCDK > Hydronephrosis). * **Most common neonatal renal malignancy:** Congenital Mesoblastic Nephroma (not Wilms tumor, which peaks at 3–4 years). * **Most common neonatal adrenal mass:** Adrenal Hemorrhage (often presents with jaundice and a drop in hematocrit). * **Initial Investigation:** Ultrasonography is the gold standard first-line investigation for any suspected neonatal abdominal mass.

Q: Charge syndrome includes all of the following except:

Esophageal atresia. **Explanation:** **CHARGE syndrome** is a rare genetic disorder caused by mutations in the **CHD7 gene**. It is diagnosed based on a specific constellation of clinical features. The correct answer is **Esophageal atresia**, as it is not a primary component of the CHARGE mnemonic, although it can occasionally occur as a secondary complication. The mnemonic **CHARGE** stands for: * **C – Coloboma:** Typically bilateral chorioretinal colobomas, but can involve the iris or optic nerve. This is a hallmark ophthalmic finding. * **H – Heart defects:** Most commonly Tetralogy of Fallot, PDA, or VSD. * **A – Atresia choanae:** Narrowing or blockage of the nasal passages (membranous or bony). * **R – Retardation of growth and development:** Both physical growth and mental development are often delayed. * **G – Genitourinary anomalies:** Such as cryptorchidism, micropenis, or renal malformations. * **E – Ear abnormalities:** Characteristically includes "cup-shaped" ears and sensorineural hearing loss or semicircular canal hypoplasia. **Why other options are incorrect:** * **Coloboma (A), Heart defects (B), and Urogenital anomalies (C)** are all core diagnostic criteria represented by the letters C, H, and G in the mnemonic. **Clinical Pearls for NEET-PG:** * **Gene:** CHD7 (Chromodomain helicase DNA binding protein 7) on chromosome 8q12. * **Most common ocular finding:** Chorioretinal coloboma (present in ~80% of cases). * **Differential Diagnosis:** VACTERL association (which *does* include Esophageal atresia/Tracheoesophageal fistula). * **Key Diagnostic Sign:** Hypoplasia of the semicircular canals is highly specific for CHARGE syndrome.

Question 1

About trisomy 13, which of the following is a true statement?

Accepted Answer

Bilateral microphthalmia

Answer

Neurofibroma

Answer

Rocker bottom feet

Answer

Dermoid cyst

Question 2

Which vitamin is administered to newborns to prevent hemorrhage?

Accepted Answer

Vitamin K

Answer

Vitamin E

Answer

Vitamin D

Answer

Vitamin A

Question 3

What is the ponderal index in malnourished babies?

Accepted Answer

Less than 2

Answer

Less than 1

Answer

Less than 4

Answer

Less than 6

Question 4

A premature baby born to a diabetic mother presented with respiratory distress and was admitted to the neonatal intensive care unit. Which of the following findings indicates Respiratory Distress Syndrome (RDS) in a newborn?

Accepted Answer

Presence of an air bronchogram on chest X-ray

Answer

Onset of symptoms after 6 hours of age

Answer

Antenatal corticosteroid therapy administered to the mother

Answer

The baby being born at term gestation

Question 5

A boy presents with multiple bullous lesions on his trunk and periostitis observed on x-rays. What is the most appropriate next investigation?

Accepted Answer

VDRL testing for mother and child

Answer

PCR for maternal tuberculosis

Answer

HBsAg screening

Answer

ELISA testing for mother and child

Question 6

What are keratin-filled cysts commonly found along the midpalatine raphe of a newborn called?

Accepted Answer

Epstein pearl

Answer

Bohn's nodule

Answer

Median palatine cyst

Answer

Eruption cyst of newborn

Question 7

What is the most common obstetrics nerve palsy observed in newborns?

Accepted Answer

Facial nerve

Answer

Sural nerve

Answer

Tibial nerve

Answer

Common peroneal nerve

Question 8

Which of the following scoring systems is used to assess respiratory distress in neonates?

Accepted Answer

Silverman-Anderson score

Answer

CRIB score

Answer

APGAR score

Answer

SNAP score

Question 9

What is the most common cause of an abdominal mass in neonates?

Accepted Answer

Multicystic dysplastic kidney

Answer

Neuroblastoma

Answer

Polycystic kidney

Answer

Umbilical hernia

Question 10

Charge syndrome includes all of the following except:

Accepted Answer

Esophageal atresia

Answer

Coloboma

Answer

Heart defects

Answer

Urogenital anomalies

Neonatology — MCQs

Neonatology — MCQs

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