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Cisternography and CT Scanning with 111In-DTPA in Evaluation of Posterior Fossa Arachnoid Cysts

A patient with a large, long-standing posterior fossa arachnoid cyst was evaluated. Computed tomography was used to demonstrate the cyst. 111In-DTPA cisternography demonstrated the communication of the cyst with the subarachnoid space, stasis of the 111In in the cystic space, and incomplete ascent of cerebrospinal fluid over the cerebral hemispheres.