Chronic Extradural Hematoma of the Posterior Fossa

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Abstract
A case of chronic extradural hematoma of the posterior fossa associated with a diagnostic pneumoencephalo-graphic finding was reported. The patient had sustained 2 episodes of head trauma which occurred 14, and 1 years prior to admission. She presented with headaches, disorientation and moderate truncal ataxia, and the eyegrounds revealed chronic papilledema. Skull films were negative. A combined air study revealed a comma-shaped posterior indentation of the cisterna magna, characteristic of an extraarachnoidal mass which proved, on exploration, to be a laminated extradural clot of considerable age. The condition is the result of trauma, and all previously reported cases, save that of Turnbull (J. Neurosurg. 1:321, 1944), were acute in nature. Thus, this was the 2d chronic case on record, and the 1st to be associated with a diagnostic X-ray finding.

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