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Answer 19-25. The most common cause is hypertensive (it can be acute due to stimulant abuse), and this is intraparenchymal. Aneurysms (berry aneurysm) and arteriovenous malformations may rupture into the subarachnoid space (often with some extension into the parenchyma). Trauma is the most common cause of epidural and subdural hemorrhage., although trauma can also produce intraparenchymal bleeding (contusion). Anticoagulation, either iatrogenic or secondary to pathological condition (like liver disease, thrombocytopenia, etc) can contribute to hemorrhage (especially subdural).