Complete regression of a congenital splenic cyst

We report a congenital splenic cyst that was revealed by prenatal sonography at 31 weeks' gestation. Serial prenatal sonographic examinations showed a slight enlargement of the cyst. However, sonography performed when the infant was 7 months of age showed the cyst had spontaneously and completely regressed. We recommend that practitioners adopt a more conservative approach in such infants, one that includes follow-up sonographic examinations, rather than instituting interventional treatment.