Introduction of subdural hematoma of brain

Subdural hematoma refers to a person who has clinical symptoms for more than 3 weeks after brain injury. The hematoma is located between the dura mater and the arachnoid membrane, and has a capsule. It is the most common intracranial hematoma in the elderly. Chronic subdural hematoma accounts for 25% of subdural hematoma. At present, it is believed that chronic subdural hematoma is caused by the tearing of bridging vein caused by mild craniocerebral trauma, and blood slowly overflows into subdural cavity. Hematomas are mostly unilateral, and bilateral hematoma accounts for about 20% ~ 25%. There are obviously more male patients than female patients, and the ratio of male to female is 5∶ 1. When the course of disease is long and the history of head injury is unclear, it is often misdiagnosed as brain tumor, cerebrovascular disease, Parkinson's syndrome and so on.