Figure 19b. LCH of the skull base. (a) Radiograph of the skull shows a typical punched-out lesion of the right occipital bone (black arrow) and a large erosive lesion of the left temporal bone (white arrow). (b) Axial CT scan again shows the erosive lesion of the left temporal bone (arrow), as well as a smaller erosive lesion of the right temporal bone (arrowhead).