major etiologies underlying postoperative intracerebral hemorrhages were uncontrolled bleeding from a blind area , difficult dissection of a tumor from the brain , retraction injury , vessel injury from a needle , bleeding from a residual tumor , local hemodynamic changes after removal of a tumor , premature rupture of an aneurysm , and hypertensive putaminal hemorrhage .
C0032788
postoperative
C0019080
bleeding