双侧慢性硬膜下血肿。机化使血块呈现棕色到黑色之间。因为是静脉出血，硬膜下血肿比因动脉出血形成血块更慢,更隐匿，硬膜下血肿在低年龄群体和老年人更常见。
Here is a bilateral chronic subdural hematoma. The blood clots are brown to tan because of organization. Since the bleeding is venous, subdurals can form more slowly and insidiously than clots from arterial hemorrhages. Subdurals are most common in the very young and the elderly.