9    Extraaxial and Subarachnoid Hemorrhage

Subdural hematomas (SDH) are most frequently seen in the setting of trauma, particularly in older individuals, and result from injury to the veins bridging the subdural space. Because their signal characteristics may at many stages be isointense to parenchyma (Fig. 9.1A, T2WI) or the diploic space, they may be difficult to detect on MRI, depending in particular on the pulse sequence acquired. SDH typically exhibit a crescentic shape and do not cross dural attachments at the venous sinuses (Fig. 9.1B, arrows, T1WI). The evolution of SDH SI follows that of intraparenchymal hemorrhages (see Chapter 8). In a child, the presence of multiple SDH of various temporal stages (Fig. 9.2A, T2WI, Fig. 9.2B

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