Yes, NSG and USG cranium are the same imaging technique
Neurosonography (NSG) and cranial ultrasound (USG cranium) are essentially the same modality—both refer to ultrasound imaging of the brain, particularly in neonates and infants through open fontanelles and other acoustic windows.
Terminology Clarification
The terms are used interchangeably in clinical practice and medical literature. Both describe ultrasound examination of the brain, with the following characteristics:
- Primary application: Imaging the infant brain through the anterior fontanelle and other acoustic windows (mastoid fontanelle, posterior fontanelle) 1
- Target population: Predominantly neonates and young infants with open fontanelles, though can be used in older children and adults through specific acoustic windows 2, 3
- Technical approach: Uses the same ultrasound equipment, transducers, and scanning protocols 4, 3
Clinical Context from Guidelines
The 2020 ESPNIC guidelines consistently refer to this imaging as "cranial ultrasound" or "cerebral POCUS" (Point-of-Care Ultrasound), emphasizing that children are especially amenable to cranial ultrasound since their skulls remain not yet ossified and their fontanelles open 1. The guidelines make no distinction between "neurosonography" and "cranial ultrasound"—they are the same procedure.
Key Clinical Applications (Identical for Both Terms)
Both NSG and cranial USG are used for:
- Detecting intraventricular hemorrhage (IVH) in preterm infants—the primary screening tool with strong evidence (Quality A) 1
- Assessing cerebral blood flow changes and raised intracranial pressure 1
- Evaluating periventricular leukomalacia and other ischemic injuries 2
- Diagnosing congenital brain malformations 2, 3
- Monitoring hydrocephalus and ventricular size 3
Important Caveats
While the terms are synonymous, recognize that:
- NSG/cranial ultrasound has limitations: Normal studies do not exclude significant brain injury—44% of neonates with MDI <70 had normal discharge neurosonograms 5
- MRI is often needed: For detailed parenchymal injury assessment and in very preterm infants with neurological symptoms 4
- Operator-dependent: Requires experienced hands for accurate interpretation 4, 3
The distinction you may encounter is purely semantic—different institutions or practitioners may prefer one term over the other, but they describe the identical imaging technique 2, 3, 6.