Large, about 65 x 40 x 40 mm right frontal, inhomogeneously hyperdense collection. The lesion is seemingly extra-axial, separate from the brain parenchyma. Altogether findings are suggestive of bleeding into a pre-existing cystic lesion, likely an arachnoid cyst. Resultant midline shift, compression of ipsilateral sulci supratentorially, and compression of the right lateral ventricle, subfalcine and descending transtentorial herniation. A rim of subdural lower density collection is also visible with a maximum thickness of 15 mm, in keeping with hygroma.