Rhinosporidiosis: A Rare Cause of Proptosis and an Imaging Dilemma for Sinonasal Masses

Figure 2

(a) T2-weighted MRI sagittal section showing heterogeneously hyperintense multilobulated mass originating from nasal cavity and nasopharynx and extending into oropharynx. Lesion shows few flow voids within. (b) Postcontrast T1-weighted MRI coronal section showing enhancing mass lesion in inferior portion of right orbit. There are few nonenhancing areas within. Lesion is extending into the inferior turbinate via nasolacrimal duct. (c) Postcontrast T1-weighted MRI sagittal section showing intensely enhancing multilobulated mass originating from nasal cavity and nasopharynx and extending into oropharynx. Lesion shows few nonenhancing areas within. Lesion shows multilobulated external surface mimicking cerebriform appearance of inverted papilloma. (d) Postcontrast T1-weighted MRI sagittal section showing extraconal, intraorbital, intensely enhancing mass extending into the nasal cavity via nasolacrimal duct. The mass is protruding outside of the orbital margins causing proptosis.

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