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Neurosonography: Cranial Ultrasound in Neonates and Infants

What Is Neurosonography?

Neurosonography (cranial ultrasound) uses high-frequency transducers through the open anterior fontanelle to image the neonatal brain. It is the primary bedside neuroimaging tool for preterm and term infants.

Indications

  • Routine screening in preterm <32 wks or <1500g (IVH detection).
  • Suspected HIE (hypoxic-ischemic encephalopathy).
  • Neonatal encephalopathy, seizures, abnormal tone.
  • Congenital anomalies (hydrocephalus, agenesis of corpus callosum, Dandy-Walker).
  • Infection (CMV, HSV, Zika, syphilis).
  • Post-hemorrhagic ventricular dilation (PHVD) monitoring.
  • Vascular: stroke, sinus thrombosis, vein of Galen malformation (with Doppler).

Technique

  • Transfontanelle: Coronal and sagittal planes via anterior fontanelle (primary).
  • Supplemental windows: Posterior fontanelle (cerebellum, posterior fossa), mastoid (temporal lobes), temporal (temporal lobes, basal ganglia).
  • Doppler: Cerebral arterial/venous flow, resistive index.

Key Findings

ConditionUltrasound Appearance
Grade I–II IVHGerminal matrix / ventricular hemorrhage (hyperechoic)
Grade III IVHVentricular dilation + hemorrhage
Grade IV IVH (PIH)Parenchymal hemorrhagic infarction
PVL (Periventricular Leukomalacia)Periventricular cysts (chronic) / increased echogenicity (acute)
HIEBasal ganglia/thalamic hyperintensity (acute); atrophy (chronic)

Advantages

  • Bedside, portable, no radiation, no sedation, repeatable, low cost.

Limitations

  • Fontanelle closure limits use after ~12–18 months.
  • Operator-dependent; limited posterior fossa / cortical detail vs. MRI.
  • Cannot image through bone.

Neurosonography is indispensable for neonatal neurocritical care.

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