Computed tomography of arachnoid cysts.

The typical CT appearance of intracranial arachnoid cysts may obviate additional neuroradiological procedures. Ventriculography using water-soluble contrast media may differentiate a suprasellar arachnoid cyst from a dilated third ventricle. Twelve cases are presented.

Epidural hematoma of the posterior fossa: radionuclide features.

Since epidural hematomas usually present as acute neurosurgical emergencies, they are rarely studied by radionuclide imaging. An epidural hematoma in the posterior fossa showed characteristic anterior displacement of the torcular Herophili and separation of the superior sagittal sinus from the inner table of the skull on cerebral radionuclide imaging and angiography.