Fig. 2. Initial CT scan of 70 years old male shows traumatic subarachnoid hemorrhage at the right frontal lobe (A). Follow-up T2-weighted MRI demonstrated newly developed subdural hygroma (arrow) at the both frontal lobe (B), and strong enhancement of pachymeninx (arrow) (C) on contrast-enhanced fluid-attenuated inversion recovery imaging after 2 days from trauma. Subdural hygroma developed into chronic subdural hematoma (arrow) at the right hemisphere after 3 month (D). The amount of subdural hematoma decheased after surgical drainage (E). CT : computed tomography, MRI : magnetic resonance imaging.