Non-contrast head CT axial images in brain and bone windows show an approximately 4cm well-marginated osteolytic lesion centered in the right frontoparietal calvarium with associated overlying subcutaneous edema and gas. Additionally, there is a hyperdense epidural fluid collection adjacent to the osteolytic lesion and overlying the right frontal lobe. There is some associated vasogenic edema along the right frontal lobe anteriorly.