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Primordial odontogenic tumour: clinicopathological analysis of six cases of a previously undescribed entity
Author(s) -
MosquedaTaylor Adalberto,
Pires Fabio Ramoa,
AguirreUrízar José Manuel,
CarlosBregni Roman,
PiedraGarza José Mario,
MartínezConde Rafael,
MartínezMata Guillermo,
CarreñoÁlvarez Sergio J,
Silveira Henrique Martins,
Barros Dias Bruno Santos,
Almeida Oslei Paes
Publication year - 2014
Publication title -
histopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.626
H-Index - 124
eISSN - 1365-2559
pISSN - 0309-0167
DOI - 10.1111/his.12451
Subject(s) - enamel organ , pathology , dental papilla , vimentin , lesion , adamantinoma , ameloblastoma , epithelium , odontogenic tumor , biology , odontogenic myxoma , medicine , anatomy , odontogenic , maxilla , immunohistochemistry , enamel paint , dentin , dentistry , odontoblast , ameloblast
Aim To describe the clinicopathological and immuno‐histochemical features of six tumours that do not fulfil the criteria of any of the currently classified odontogenic tumours. Methods and results The patients were three males and three females, whose ages ranged from 3 years to 18 years (mean, 11.05 years). In all cases there were well‐defined radiolucencies associated with unerupted teeth apparently showing a pericoronal relationship. Microscopically, all tumours were composed of variably cellular loose fibrous tissue with areas similar to dental papilla, entirely surrounded by cuboidal to columnar epithelium resembling the internal epithelium of the enamel organ. Mesenchymal tissue was positive only for vimentin, and Ki67 expression was very low (<2%). The epithelium was positive for CK AE 1/ AE 3, CK 5, CK 14, and CK 19, but negative for CK 18 and CK 20. All cases showed clear demarcation from the surrounding bone, and were surgically removed, with no recurrences after follow‐up ranging from 6 months to 20 years. Conclusions These findings differ from those observed in other odontogenic lesions, such as ameloblastic fibroma, odontogenic myxoma, odontogenic fibroma, and hyperplastic dental follicles. The term primordial odontogenic tumour is proposed to describe this novel lesion.