Pre-operative non-contrast CT head. Axial cut at the level of the frontal sinus demonstrates a large right frontal, extra-axial, heterogeneously dense mass measuring 5.7cm x 6.5cm x 5.0cm in size (black arrow). The mass is surrounded by notable vasogenic edema (yellow arrow) causing midline shift and subfalcine herniation. A right frontal subgaleal hematoma is evident without adjacent skull fracture (blue arrow).