Ameloblastic carcinoma (secondary type) with extensive squamous differentiation areas and dedifferentiated regions

Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Felipe Paiva FonsecaHélder Antônio Rebelo Pontes

Abstract

Ameloblastic carcinoma is rare, accounting for 1.5%-2.0% of all odontogenic tumors. Few small series are available, but data on its clinicopathologic characteristics derive mainly from single case reports; therefore, descriptions of new cases may help to better understand the biological characteristics of this rare odontogenic malignancy. In the current report we describe an ameloblastic carcinoma affecting a 27-year-old female patient who had a previous diagnosis of ameloblastoma 7 years before. The carcinoma featured extensive areas of squamous differentiation resembling a primary intraosseous squamous cell carcinoma, as well as areas of dedifferentiation, a poorly documented histologic characteristic of ameloblastic carcinoma. This case provides new insights on the microscopic spectrum of ameloblastic carcinoma, permitting a critical discussion of the current World Health Organization classification of this odontogenic tumor.

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Citations

Sep 30, 2016·Histopathology·Eduardo R FregnaniFábio A Alves
Feb 18, 2018·Journal of Oral Pathology & Medicine : Official Publication of the International Association of Oral Pathologists and the American Academy of Oral Pathology·Felipe Paiva FonsecaEduardo Rodrigues Fregnani
May 2, 2018·The Cleft Palate-craniofacial Journal : Official Publication of the American Cleft Palate-Craniofacial Association·Artur FahradyanLori Kathryn Howell
Feb 11, 2019·Journal of Oral Pathology & Medicine : Official Publication of the International Association of Oral Pathologists and the American Academy of Oral Pathology·Filipe Fideles Duarte-AndradeFelipe Paiva Fonseca
Dec 31, 2020·Journal of Oral Pathology & Medicine : Official Publication of the International Association of Oral Pathologists and the American Academy of Oral Pathology·Maria Sissa Pereira Sant'AnaFelipe Paiva Fonseca
Nov 13, 2020·Orphanet Journal of Rare Diseases·Zhixing NiuLei Su
Jun 16, 2021·Head and Neck Pathology·Gustavo de Souza VieiraDanielle Castex Conde

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