Fetal arachnoid cyst: report of two cases

Two new cases of antenatal diagnosis of arachnoid cyst are described. Diagnosis was made at 2.5 and 32 weeks' gestational age. In the first case, a slight increase in the diameter of the anechoic mass was observed in the second trimester. In the second case, ventricular dilatation was present prenatally. Appropriate surgical therapy was initiated at 2 months in the first case and at 8 days in the second and the neurological development of the two children is considered as normal at 18 months of age. Major features of in utero diagnosis, treatment and follow-up are discussed.