Prenatal sonographic appearance of asymmetric craniosynostosis: a case report.

Craniosynostosis is the premature fusion of one or more cranial sutures.1.2 Depending on the sutures involved, a characteristic skull deformity usually results.J Premature closure of a suture restricts expansion of the calvarium adjacent to the suture. Because adjacent areas of the skull overexpand to accommodate the growing brain, a lobulated appearance can result. In our patient prenatal sonography demonstrated an unusual asymmetric multilobulat· ed skull caused by craniosynostosis resulting from premature synostosis of a coronal and a sagittal suture. Prenatal diagnosis of the symmetric trilobu· Ia ted skull has been previously reported.4-10 We present here the sonographic appearance of a more unusual asymmetric craniosynostosis.