Abstract: This paper presents 11 cases of pathological subarachnoid hemorrhage occured after head injury. All of them were caused by the disease found in the vessels of the brain, which was determined by autopsy examination' Among these cases, three of them could be diagnosed clearly by the naied eye observation while eight of them must be examined by microscopy. Seven cases of subarachnoid hemorrhage was secondary to head injury; and the other 4 cases had no obvious rebation with head injury.

Key words: head injury, subarachnoid hemorrhage, vascular disease