[Bilateral chronic subdural hematoma associated with hypotension of the cerebrospinal fluid]

A case is presented of a bilateral chronic subdural hematoma complicated in the post-operative evolution by a severe brain-stem suffering associated to a CSF hypotension andan angiographic descent of the brain-stem. The whole picture was made reversible by means of intrathecal injections of saline and the Trendelemburg position. The physiopathology of cerebral hypotension is discussed, considering it as an evolution process that implies both a diminution of the CSF and a descent of the brainstem. This process can be initially free of symptoms.