| Summary: | Inverted papilloma is an uncommon histopathological finding of maxillary sinus tumor. We
reported here a rare case of inverted papilloma of maxillary sinus presented initially with
ipsilateral proptosis. A middle-aged lady with history of having allergic rhinitis presented
with progressive left eye proptosis. Assessment revealed presence of orbital mass arising from
paranasal sinus, in which the histopathological examination was initially inconclusive, and
later it turned up to be inverted papilloma, partly with malignant transformation. High index
of suspicion is necessary especially in those patients with recurrent non-specific sinonasal
symptoms, which may need repeated biopsy and histopathological examination. Ocular
manifestation signifies a more advance disease.
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