Subarachnoid metastatic disease was evaluated in 17 children with primary intracranial neoplasms at the Departments of Neurology and Radiology, The Children’s Hospital of Philadelphia, PA. The tumors were principally neuroectodermal, ependymomas, and astrocytomas and the majority originated in the posterior fossa. The gadolinium MRI was superior in delineating spinal cord nodules and “sugar coating” whereas myelography and CT more readily revealed nerve root sleeve filling defects. 
COMMENT. Gadolinium-enhanced MRI appears to be a safe non-invasive test and the technique of choice for the diagnosis of subarachnoid metastatic disease.