Significance of the midline echo in the ultrasound diagnosis of hydrocephalus.

Abstract

Fetal intracranial anatomy can now be visualized as early as the 13th to 15th menstrual week using commercially available ultrasound equipment. It has consequently become possible to diagnose hydrocephalus early in pregnancy, often in the second trimester. We present a case of unsuspected hydrocephalus diagnosed in utero which demonstrated marked undulation of the midline echo. The significance of the midline echo and the diagnostic criteria in evaluating hydrocephalus are discussed.