Figure 28.

Mucocele. (A) Coronal CT image shows well-defined hypodense lesions in the bilateral ethmoid air cells with bony scalloping and dehiscence of the bilateral lamina papyracea. Additionally, note the extension into the orbits, which are greater on the right side (arrows). (B) Axial fat-suppressed T2W image shows moderate hyperintense signal in the lesions. (C) Coronal noncontrast T1W image demonstrates moderate corresponding hyperintense signal consistent with proteinaceous contents. (D) Axial postcontrast fat-suppressed T1W image demonstrates thin peripheral enhancement consistent with compressed mucosa. Mild mass effect on the right medial rectus muscle is noted.