Hi, As you have mentioned that CT scan remark - large intraparenchymal hematoma in the right parietal lobe with intraventricular extension and subfalcine herniation. subarachnoid hemorrhage. Your father had hemorrhagic stroke. It can be caused by hypertension or aneurysm (outpouching of blood vessels) and trauma. Location of bleeding some times give the cause, in your case its probably from an aneurysm. At present, it is important to stabilize the patient s condition, control the bleeding by controlling hypertension. TH also mentioned hydrocephalus and herniation which is worrisome for that he might be requiring surgical intervention such as external ventricular drainage or decompressive craniectomy. But you should be aware that this will only take care of hydrocephalus and herniation but not he internal bleeding. The purpose of ventricular drainage and decompressive craniotomy is to save a life. Damage that happens due to bleeding will not alter. Next thing is to find out the cause for the same it will require DSA / angiography. If aneurysm presents it will require clipping or coiling to stop rebleeding. The outcome depends on the premorbid health status of the patient, risk factors such as diabetes, hypertension, and age of the patient. I will suggest taking a consultation with neurologist, neurosurgery, interventionist, intensive care specialist. It needs a collective discussion and management. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Mahendra Shivram Thakre, Internal Medicine Specialist