A 5-month-old child came for a follow-up ultrasound due to increased periventricular echogenicity (immaturity of the brain); the craniocerebral space examined by ultrasound at the age of 1 month was normal.
On the current ultrasound, subconvexital (craniocerebral) space up to 9 mm (normal < 6mm): subdural space up to 5 mm (differential diagnosis: subdural hematoma/ hygroma).
