Subdural and epidural hematomas (Fig. 6.6) are well demonstrated on T1- and T2-weighted images. In the acute and subacute stages,the signal intensity is often similar to intraparenchymal hematomas. In the chronic stage, MR images often show hyperintensity of the hematoma,which may be iso- to hypodense on CT [34,61-67].
Diffusion-weighted imaging findings of subdural and epidural hematomas have not been well described. Lin et al. reported that all three lesions could be detected on b0 images, but GRE images were better at detecting lesions . The benefit of DW imaging is probably for the detection of underlying or associated parenchymal lesions [68,69].
Figure 6.6 a-f
Subacute subdural hemorrhage (extracellular met-hemoglobin). A 49-year-old woman with headache following head trauma had an MR examination 2 weeks after the trauma, which shows right subdural hemorrhage as a hyperintense lesion (arrows) on the Tl-weighted (a) and T2-weighted (b) images.The lesion was hyperintense on the DW (c) and the b0 (d) images (arrows).On the ADC map (e) there are hypointense lesions (arrows),which correspond to the hyperintense lesions on the DW image (c).The coronal GRE image (f) shows the subdural hemorrhage to be hyperintense (arrows)
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