title: Follicular adenomatoid odontogenic tumor: immunohistochemical study.
abstract: Adenomatoid odontogenic tumor (AOT) is an uncommon benign odontogenic lesion that affects young patients, with female predominance, mainly in second decade, showing a radiolucent unilocular image associated with an unerupted tooth, usually a canine. In spite of previous and confusing denominations, such as adenoameloblastoma or adenomatoid ameloblastic tumor, AOT is a benign tumor with a very low rate of recurrence, that show a peculiar morphological picture (basaloid appearance with glandular-like structures, calcifying areas, and amiloid-like material) that allow its histopathological recognition. We present a clinicopathological analysis of a case of follicular AOT affecting the mandible in a 9 years-old female patient associated with unerupted lower left canine. Immunohistochemical study showed some data previously unrecognised. All cellular types that composed AOT showed nuclear positivity for p63 indicating a basal characterization in the different cellular components. According to its benign character and low potential for recurrence, AOT revealed a scant proliferative activity (2-3% nuclei showed Ki-67 positivity) limited to some epithelial nodules (AE1-3 +) of fusiform appearance. Absence of reactivity for hormonal receptors (RE and RPg) excluded a possible hormonodependence in AOT that could explain the observed female predominance.
authors.affiliation: Department of Pathology, Hospital Universitario La Fe, Universidad de Valencia. vera_fra@gva.es
authors.forename: Francisco José
authors.initials: FJ
authors.lastname: Vera Sempere
authors.forename: María Jose
authors.initials: MJ
authors.lastname: Artes Martínez
authors.forename: Beatriz
authors.initials: B
authors.lastname: Vera Sirera
authors.forename: Jaime
authors.initials: J
authors.lastname: Bonet Marco
mesh_terms: D000236:Adenoma / Q000473:pathology; D002648:Child; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008339:Mandibular Neoplasms / Q000473:pathology*; D009808:Odontogenic Tumors / Q000473:pathology*