Cranial ultrasound in neonatal herpes simplex encephalitis.

Neonatal infection with herpes simplex virus (HSV) is associated with significant morbidity, high mortality, and long-term neurological sequelae. We report the clinical case of an infant with HSV encephalitis, where the initial diagnosis was established based on cranial ultrasound (CUS) findings. These findings revealed localized, asymmetrically distributed hyperechoic areas in the parenchyma and signs of brain swelling. CUS dynamics on days 7 and 14 after the onset of clinical symptoms demonstrated multiple subcortical and perivascular zones of encephalomalacia in the right hemisphere, accompanied by ex vacuo ventricular dilatation. The cerebellum, left basal ganglia, and left hemisphere appeared to be less affected by the pathological process.