Cavum Vergae: In the DifferentialDiagnosis of Fetal Midline Intracranial Cystic Lesions

摘要

Cavum vergae (CV) cysts are developmental cysts of the midline of the brain that is formed from the posterior extension of the cavum septum pellucidum. Several cases of enlarged CV have been reported previously, but prenatal diagnosis of this condition is very rare. We report a case of isolated dilated CV diagnosed prenatally. When midline intracranial cysts are determined prenatally, first physicians must pay attention to distinguish them from pathologic cyst and determine whether associated malformations are present or not. The sonography is a useful tool for both the differential diagnosis and identification of associated malformations.