[A case of posterior fossa acute subdural hematoma diagnosed through extravasated contrast media (author's transl)].

The authors report a case of posterior fossa acute subdural hematoma diagnosed preoperatively through extravasted contrast media from the hemispheric branch of the posterior inferior cerebellar artery along a linear fracture across the transverse sinus unto the pyramis. In a review of the literature it is to be noted that in acute cases, nystagmus and cerebellar signs are very rare and patients fall in coma within 24 hours after injury with promptly advancing severe brain stem compression signs in contrast to subacute or chronic cases. Therefore, whenever the diagnosis is suspected, time should not be lost for a burr hole opening and decompressive craniectomy. Vertebral angiography is sometimes very confirmative but it should be done only when time affording.