during the past five years , a number of reports have described the ultrasound features of intracranial infection , including echogenic sulci , extra-axial fluid collections , ventricular enlargement , calcifications , abnormal parenchymal echogenicity , abscess formation , cystic degeneration of the brain parenchyma , intraventricular echogenicity , ventricular septations and irregularity and prominence of the ventricular walls .
C0009450
infection
C0000833
abscess