Legend Left: Coronal CT of the paranasal sinuses shows soft tissue density filling the left maxillary sinus and bowing the medial wall of the sinus into the nasal cavity. Rounded soft tissue density is also seen arising from the floor of the right maxillary sinus. Right: Axial T2 and Coronal T1 images of the sinuses show that the right maxillary sinus density has high T2 and low T1 signal, well defined borders and spherical shape. The left maxillary sinus mass has heterogeneously low T1 and T2 signal with expansion into the nasal cavity. The floor of the left orbit remains intact.

Legend Contrast enhanced coronal and axial T1 images show no enhancement of the right maxillary mass. However, the left maxillary mass enhances almost uniformly with an area of non-enhancement in its lateral aspect. Key words: ct sinus tumor neoplasia infection inflammation

ENT Diagnosis: Inverted papilloma (left) & polypoid chronic sinusitis