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In a patient with cerebellar hemorrhage due to hypertension, deterioration may be so rapid there is not sufficient time for radiographic studies prior to craniectomy.
In the less critically ill patient, posterior fossa angiography is the procedure of choice and is highly accurate in localizing the mass lesion.
Angiography is particularly helpful in the patient with an atypical presentation because an etiology of the hemorrhage other than hypertension may be demonstrated.
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