Non-contrast head CT reveals hyperdense extra-axial collection overlying the right hemisphere consistent with acute subdural hematoma. The subjacent sulci and gyri are effaced and there is mild mass effect on the right lateral ventricle. There is approximately 7mm of leftward shift of midline structures, however, symmetry of the basal cysterns is preserved. Incidentally, there is mucosal thickening of the paranasal sinuses. Bone windows (not included) did not reveal a fracture.