The results of a prospective cooperative multi center study on hypertensive intracerebral hemorrhage in Japan are reported. Nine neurosurgical centers participated in this study during from January to December 1999. Total of 717 cases were registered and followed up for one month. Among then, 603 cases were admitted on day 0. Neurological grade at admission were as follows ; grade-1, 354 cases ; grade-2, 78 cases ; grade-3, 49 cases ; grade-4a, 43 cases ; grade-4b, 79 cases ; grade 5, 39 cases. 510 cases (73.2%) were treated conservatively and 185 cases (26.8%) were treated surgically. Incidences of surgical treatment and method of surgical evacuation of the hematoma such as craniotomy or trepanation were variable in each center. Brain stem hemorrhage showed the worst prognosis and subcortical and cerebellar hemorrhage were the better results. Incidence of mortality was less and morbidity was higher in the cases of surgical treatment.
