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WHO Classification of Tumours
Transitional cell papilloma, inverted, NOS
Nasal cavity and Sinuses


Definition

A papilloma derived from the Schneiderian membrane composed of papillary fronds with delicate fibrovascular cores covered by multiple layers of epithelial cells.
Histopathologically, the term transitional cell papilloma is used synonymously for exophytic papilloma / Schneiderian papilloma, exophytic type

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Barnes L, Eveson JW, Reichart P, Sidransky D (Eds.)
World Health Organization Classification of Tumours. Pathology and Genetics of Head and Neck Tumours.
3rd Edition
IARC Press: Lyon 2005



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