Prenatal Sonographic and Magnetic Resonance Imaging Demonstration of a Right Midline Arachnoid Cyst Associated with Ventriculomegaly, Colpocephaly, Dilation of the Third Ventricle, Absence of Cavum Septi Pellucidi, Agenesis of the Corpus Callosum and Mega Cisterna Magna

摘要

A 30-year-old, gravida 3, para 2, woman was referred to the hospital at 30 gestational weeks because of an intracranial cyst. Two-dimensional ultrasound revealed a 1.31x1.99 cm hypoechoic homogeneous lesion on the right side of the midline with wide splaying of the anterior horns of the lateral ventricles (Figure 1). The finding was consistent with the diagnosis of an arachnoid cyst. There were multiple central nervous system (CNS) malformations, including bilateral ventriculomegaly, colpocephaly, a dilated third ventricle, absence of cavum septi pellucidi, agenesis of the corpus callosum, and an enlarged cisterna magna (Figure 2). Prenatal magnetic resonance imaging (MRI) confirmed the sonographic diagnosis (Figure 3). Intrauterine fetal death was noted. A dead 1,904-g male baby was delivered subsequently. The karyotype was 46,XY.