Neonatology Practice Questions

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.

Q: Which of the following conditions in a newborn typically does not require any specific treatment?

All of the above. **Explanation:** The correct answer is **D. All of the above**. This question tests the recognition of benign, self-limiting oral mucosal lesions in the newborn that are often mistaken for pathology but require no medical or surgical intervention. 1. **Epstein Pearls:** These are small (1–3 mm), firm, white-to-yellowish keratin-filled cysts found specifically along the **median palatal raphe** (junction of the hard and soft palate). They are seen in approximately 60–85% of newborns and represent trapped epithelium during palatal fusion. 2. **Bohn’s Nodules:** These are similar keratin cysts but are located on the **buccal or lingual aspects of the dental ridges** (away from the midline) or at the junction of the hard and soft palate. They are remnants of minor salivary gland tissue. 3. **Gingival Cysts of the Newborn:** Also known as Dental Lamina Cysts, these occur on the **crests of the alveolar ridges**. They originate from remnants of the dental lamina. **Why "All of the above" is correct:** All three conditions are **transient and physiological**. They are asymptomatic, do not interfere with feeding, and typically rupture or undergo spontaneous involution within a few weeks to months after birth. Therefore, parental reassurance is the only management required. **High-Yield Clinical Pearls for NEET-PG:** * **Location is Key:** Epstein pearls = Midline palate; Bohn’s nodules = Buccal/Lingual ridge; Gingival cysts = Alveolar crest. * **Differential Diagnosis:** Do not confuse these with **Natal Teeth** (teeth present at birth), which may require extraction if they are hypermobile or causing sublingual ulceration (Riga-Fede disease). * **Milium:** Similar keratin cysts found on the skin (nose/cheeks) of newborns, also requiring no treatment.

Q: All of the following are true regarding pathological jaundice except:

Increase in unconjugated bilirubin only. **Explanation:** Pathological jaundice in a neonate is defined by specific clinical criteria that distinguish it from physiological jaundice. **Why Option A is the correct answer (The Exception):** Pathological jaundice is **not** limited to an increase in unconjugated bilirubin only. It can manifest as an increase in **unconjugated bilirubin** (e.g., hemolysis, Crigler-Najjar) or **conjugated bilirubin** (e.g., biliary atresia, neonatal hepatitis). By definition, if the conjugated bilirubin fraction is **>1 mg/dL** (if TSB 20% of Total Serum Bilirubin (TSB)**, it is always pathological. **Analysis of Incorrect Options (Criteria for Pathological Jaundice):** * **Option B:** Jaundice appearing within the **first 24 hours** of life is always pathological (most commonly due to ABO or Rh incompatibility). * **Option C:** Persistence of jaundice beyond **2 weeks** in term neonates or **3 weeks** in preterm neonates is a hallmark of pathological/prolonged jaundice. * **Option D:** A rapid rise in bilirubin levels, specifically **>5 mg/dL per day** (or >0.2 mg/dL per hour), indicates a pathological process rather than normal metabolic adaptation. **High-Yield Clinical Pearls for NEET-PG:** * **Total Serum Bilirubin (TSB) Threshold:** TSB >15 mg/dL in a term neonate is generally considered pathological. * **Kramer’s Rule:** Used for clinical assessment of jaundice (Face: 5 mg/dL; Sole: 15 mg/dL). * **Treatment:** Phototherapy converts bilirubin into **lumirubin** (structural isomer), which is water-soluble and excreted in urine without conjugation. * **Most common cause** of jaundice in the first 24 hours: **ABO Incompatibility.**

Q: Vitamin K is administered to every child at what age?

At birth. **Explanation:** **Why Option A is Correct:** Vitamin K is administered to all newborns **at birth** (within the first hour) to prevent **Vitamin K Deficiency Bleeding (VKDB)**, formerly known as Hemorrhagic Disease of the Newborn. Neonates are born with low Vitamin K stores because the vitamin crosses the placenta poorly, breast milk is a poor source, and the neonatal gut is sterile (lacking the bacteria required for Vitamin K synthesis). Since Vitamin K is essential for the activation of clotting factors **II, VII, IX, and X**, immediate supplementation is critical to prevent life-threatening intracranial or gastrointestinal bleeding. **Analysis of Incorrect Options:** * **Option B (9 months):** This is the age for the first dose of Vitamin A and the Measles/MR vaccine. Vitamin K must be given much earlier to prevent early and classical VKDB. * **Option C (5-6 years):** This is the age for the DPT second booster. Vitamin K is not routinely supplemented at this age as the gut flora is well-established. * **Option D:** This is incorrect. Indian babies, especially those exclusively breastfed, are at high risk for late VKDB; hence, universal prophylaxis is mandatory. **High-Yield Clinical Pearls for NEET-PG:** * **Dosage:** 1 mg IM for neonates >1000g; 0.5 mg IM for neonates <1000g. * **Route:** Intramuscular (IM) is the preferred route for maximum efficacy. * **Site:** Anterolateral aspect of the thigh (Vastus lateralis). * **VKDB Types:** Early (first 24 hrs), Classical (days 2-7), and Late (2 weeks to 6 months). Late VKDB is most commonly associated with exclusive breastfeeding and liver disease.

Question 1

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 2

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 3

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 4

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 5

Charge syndrome includes all of the following except:

Accepted Answer

Esophageal atresia

Answer

Coloboma

Answer

Heart defects

Answer

Urogenital anomalies

Question 6

Which of the following best describes Level 3 newborn care?

Accepted Answer

Care for neonates with less than 32 weeks gestation and less than 1500 gm, and those with critical illnesses.

Answer

Includes the full range of advanced subspecialities, including cardiac surgery.

Answer

Care for neonates with more than 32 weeks gestation and 500 gm.

Answer

Ability to provide CPAP and ventilation for brief periods.

Question 7

Which of the following conditions in a newborn typically does not require any specific treatment?

Accepted Answer

All of the above

Answer

Epstein pearls

Answer

Bohn’s nodules

Answer

Gingival cysts of the newborn

Question 8

All of the following are true regarding pathological jaundice except:

Accepted Answer

Increase in unconjugated bilirubin only

Answer

May appear within the first 24 hours

Answer

May persist beyond 3 weeks

Answer

Maximum bilirubin > 5 mg/24 hours

Question 9

A 32-week preterm baby presents with diffuse bilateral opacities on chest X-ray. What is the most likely diagnosis?

Accepted Answer

Respiratory distress syndrome (RDS)

Answer

Congenital cystic adenomatoid malformation

Answer

Congenital diaphragmatic hernia

Answer

Tracheoesophageal fistula

Question 10

Vitamin K is administered to every child at what age?

Accepted Answer

At birth

Answer

At 9 months of age

Answer

At 5-6 years of age

Answer

Not required in Indian babies

Neonatology — MCQs

Neonatology — MCQs

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