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MRI with contrast through the paranasal sinuses demonstrates a mass occupying the left maxillary antrum and widening the ostiomeatal complex. On non-contrast T1 images it is somewhat heterogeneous in intensity ranging from isointense to hypointense compared to muscle.
On T2 weighted images the mass demonstrates a striking convoluted appearance with alternating bands of markedly hyperintense tissue separated by low intensity tissue.
Following administration of contrast a similar appearance is noted, again with the so-called convoluted cerebriform pattern.
Features are characteristic of an inverted papilloma which was subsequently histologically proven.