Atrial ventricular diverticulum: sonographic diagnosis.

Diverticulum of the lateral ventricle is an uncommon occurrence in patients with hydrocephalus [1-5]. Confusing this entity with similar-appearing abnormalities such as arachnoid cysts , cystic neoplasms, or the trapped fourth ventricle must be avoided to ensure proper mangement [6-8]. Although the pathologic and CT features have been described [1] , the sonographic appearance is not widely known. Given the role that cranial sonography has assumed in evaluating the neonatal brain , it is essential that sonographers recognize this unusual entity. We report two cases of lateral ventricular diverticulum diagnosed with sonography, one with CT correlation.