Cerebellar ataxia, opsoclonus, and occult neural crest tumor. Abdominal computerized tomography in diagnosis.

A 9-month-old female with opsoclonus and ataxia was examined. Computerized axial tomography (CT) of her abdomen identified a retroperitoneal mass of neural crest origin that was not recognized by more conventional roentgenographic methods. The syndrome of cerebellar ataxia, myoclonus, and opsoclonus, and its relationship to neural crest tumors is reviewed along with the usefulness of abdominal CT.