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Ando T, Shrestha M, Nakamoto T, Uchisako K, Yamasaki S, Koizumi K, Ogawa I, Miyauchi M, Takata T. A case of primordial odontogenic tumor: A new entity in the latest WHO classification (2017). Pathol Int 2017; 67:365-369. [PMID: 28543986 DOI: 10.1111/pin.12543] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2017] [Accepted: 05/02/2017] [Indexed: 11/27/2022]
Abstract
Primordial odontogenic tumor (POT) is a rare lesion in the jaw which has been included as a new entity of benign mixed epithelial and mesenchymal odontogenic tumour in the latest World Health Organization (WHO) classification (2017). Only seven cases have been reported. It typically occurs in the posterior mandible. We report an additional case of POT in the maxilla of an 8-year-old girl presenting with an asymptomatic buccal enlargement. A well-defined, unilocular, radiolucent lesion was observed radiographically. Histologically, the tumor was mostly composed of loose fibrous connective tissue resembling dental papilla and a single layer of columnar epithelium covering the periphery of the tumor. In part, cords or nests of epithelium were present in the mesenchyme close to the periphery. Nestin, a marker of odontogenic ectomesenchyme, was positive in the mesenchymal tumor cells. We finally diagnosed the lesion as POT considering the possibility of other odontogenic tumors like ameloblastic fibroma or developing odontoma as a differential diagnosis. The patient shows no recurrence after 16 months. This case is the first report from Japan using this novel diagnosis POT after it was recognized and defined in the latest WHO classification.
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Affiliation(s)
- Toshinori Ando
- Department of Oral and Maxillofacial Pathobiology, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Madhu Shrestha
- Department of Oral and Maxillofacial Pathobiology, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Takashi Nakamoto
- Department of Oral and Maxillofacial Radiology, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Kaori Uchisako
- Department of Molecular Oral Medicine and Maxillofacial Surgery, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Sachiko Yamasaki
- Department of Molecular Oral Medicine and Maxillofacial Surgery, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Koichi Koizumi
- Department of Molecular Oral Medicine and Maxillofacial Surgery, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Ikuko Ogawa
- Center of Oral Clinical Examination, Hiroshima University Hospital, Hiroshima, Japan
| | - Mutsumi Miyauchi
- Department of Oral and Maxillofacial Pathobiology, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Takashi Takata
- Department of Oral and Maxillofacial Pathobiology, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
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