Legend Axial contrast-enhanced orbital CT demonstrates several features of a postseptal infection (true orbital cellulitis). Note the subperiostial infiltrate and abscess, stranding of the retrobulbar fat, lateral displacement of an enlarged medial rectus muscle, and proptosis. The right ethmoid air cells are filled with an aggressive appearing inflammatory disease. The individual bony septations appear destroyed and there is erosion through the thin medial orbital wall (lamina papyracea).

Legend Coronal CT also demonstrates involvement of the right frontal sinus.

Legend After aggressive therapy, there is now some aeration of the ethmoid air cells, decreased proptosis, and a decrease in size of the subperiostial abscess. The cribriform plate remains intact and there is no apparent intracranial extension. However, there is now involvement of the right maxillary sinus.

Legend Continued postseptal enhancement demonstrated on T1-WIs after gadolinium and fat saturation. Key words: mri infection inflammation fungus fungal orbit

ENT Diagnosis: Mucormycosis ethmoid sinus and orbit