Petersen O F, Espersen J O
Neuroradiology. 1984;26(4):285-92. doi: 10.1007/BF00339772.
Four types of extradural hematoma could be separated at examination of the plain CT scan in 54 extradural hematomas. Two major groups appear: the still bleeding hematoma showing either generally low attenuation values of "holes", and a coagulated homogeneous type with generally high attenuation values. The attenuation values of the bleeding - liquid part of hematoma - were correlated to hemoglobin concentration in blood, to which clots were not related. Seven extradural hematomas grew and coagulated on repeated preoperative CT scans. In two cases intravenous contrast was given to the bleeding type of hematoma, and the contrast media appeared in "holes", but not in areas of high attenuation value. It is easy to distinguish between the different types of hematoma on the plain CT scan, and the separation by eye between the still bleeding and the coagulated extradural hematoma seems reliable.
在对54例硬膜外血肿进行平扫CT检查时，可区分出四种类型的硬膜外血肿。出现了两大主要类型：仍在出血的血肿，其表现为普遍的低密度值即“空洞”，以及一种凝固的均匀类型，其普遍具有较高的密度值。血肿的出血液体部分的密度值与血液中的血红蛋白浓度相关，而血凝块与之无关。7例硬膜外血肿在术前重复CT扫描时增大并凝固。在两例病例中，对出血型血肿给予静脉造影剂，造影剂出现在“空洞”中，但未出现在高密度值区域。在平扫CT上很容易区分不同类型的血肿，通过肉眼区分仍在出血的和已凝固的硬膜外血肿似乎是可靠的。
