Inverted Sinonasal Schneiderian Papilloma
With Malignant Transformation
Dhiraj B. Nikumbh,
MD, Assistant Professor
Department of Pathology,
Kims University, Karad, Maharastra, INDIA.
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Inverted papilloma is a lesion of the mucosal membrane of the nasal cavity and the paranasal sinuses. It is a unique tumour which is characterized by its tendency to recur after incomplete removal, to destroy the bone and rarely transform to malignancy. It is a rare tumour which comprises approximately 0.5 - 4 % of all the primary nasal tumours. Different names which are used for this papilloma include villiform cancer, fungiform papilloma, cylindrical / transitional papilloma, schneiderian papilloma, transformation of papilloma and many more. We hereby report a very unusual and challenging case which elicited a range from sinonasal papilloma, with invasion , atypia and foci of transitional cell carcinoma.