Surgical versus medical treatment of spontaneous posterior fossa haematomas: a cooperative study on 205 cases.

22 Italian centres have joined together in a cooperative study aiming to define the ideal management of spontaneous posterior fossa haematomas. 205 cases have been evaluated: 155 cerebellar haematomas and 50 brainstem haematomas. Out of these, 190 cases, all studied by CT scan, are the subject of the present study. Cerebellar haematomas have been divided, according to a tomographic classification, into 3 groups: group 1 (4th ventricle not shifted), group 2 (4th ventricle shifted or obliterated) and group 3 (intraventricular blood). Each group has been subdivided into: A (no hydrocephalus), and B (hydrocephalus). Regardless of therapeutical modalities, mortality rate was 38% for cerebellar haematomas; level of consciousness a few hours after haemorrhage and size of the lesion appeared to be significant prognostic factors. As a whole, medical treatment gave better results than surgical treatment. Considering each tomographical group in detail, surgery should be limited to patients in group 2B and 3B, especially when exhibiting neurological deterioration. For brainstem haematomas, overall mortality was 57%. The possibility of survival was linked to the presence or absence of initial loss of consciousness and to the size of the lesion; while hydrocephalus did not influence the final outcome, ventricular blood was a risk factor. Surgical evacuation showed some value in chronic cases. However, medical treatment appears to be the best policy for brainstem haematomas of limited size; for larger lesions, the outcome appears to be uniformly fatal, regardless of the treatment employed.