Figure 2. (a) Axial CT sections in bone settings at the level of foramen magnum shows lytic expansion of the maxilla and paranasal bones, obliteration of the nasal cavity and mastoid cells on the left side and severe exophthalmia due to expansion of the bony orbit on the left. (b) CT section at the level of parietal bones shows marked increase in the diploic space and patchy cavern-like lucent areas (Case 1).