On a CT scan, an acute subdural hemorrhage forms a hyperdense blood collection, whereas a chronic subdural hemorrhage forms a hypodense blood collection.

在CT上，急性硬膜下出血形成高密度区域，慢性硬膜下出血则形成低密度区域。

So a subdural hemorrhage is when there's bleeding below the dura mater.

所以" Subdural Hemorrhage" 指脑部血管破裂出血至硬膜下隙。

Robert Martin, 45, collapsed and hit his head, causing a small subdural hemorrhage.

Robert martin 45岁，摔伤头部引起一个小的硬膜下血肿。

Robert Martin, 45. Collapsed and hit his head, which caused a small subdural hemorrhage.

Robert Martin，45岁。摔伤头部，引起小面积硬膜下血肿。

So the main cause of a subdural hemorrhage is a rupture of the bridging veins located in the subdural space.

硬膜下出血的主要原因就是硬膜下隙中的桥静脉破裂。

The blood in a subdural hemorrhage is located between the arachnoid mater and the inner layer of the dura mater.

硬膜下出血的血液积聚在蛛网膜和硬脑膜内层之间。

The most common symptoms of a subdural hemorrhage are loss of consciousness right after the injury or in the ensuing days to weeks, as the hematoma increases in size.

硬膜下出血最常见的症状包括：损伤后即刻的意识丧失，或是随着血肿缓慢增大，在其后数天至数周内突然失去意识。