The onset of a peripheral ameloblastoma

Revisiting Vickers and Gorlin criteria in histopathological subtypes of ameloblastoma

Background

Ameloblastoma is a benign tumour of odontogenic epithelial origin arising from enamel organ tissue that has not undergone differentiation to the point of hard tissue formation.

Aims

This study was conducted with an aim to provide a baseline data to analyse whether various histopathological variants of ameloblastoma satisfies all the characteristic histopathological features of Vickers and Gorlin criteria.

Settings and Design

A retrospective study of 25 cases of intraosseous ameloblastoma was carried out in the Department of Oral Pathology and Microbiology in accordance with the Institutional Ethics Committee.

Methods and Materials

Histopathological slides of ameloblastoma subtypes were analysed microscopically to assess Vickers and Gorlin criteria.

Statistical Analysis Used

Statistical analysis was done using the Chi-square test. A P- value of < 0.05 was set for statistical significance.

Results

Presence of hyperchromatic nuclei was seen in all the variants (100%), except for the desmoplastic variant which showed only 60% positivity. Basal cell palisading, reverse polarity and subnuclear vacuolization were seen predominantly only in acanthomatous (100%), and follicular variants (83%).

Conclusions

Vickers and Gorlin criteria have become an integral part of diagnosis of histopathological subtypes of ameloblastoma and should be applied vigilantly in the diagnosis as these may not always fulfill all the gold standard criteria when individual subtypes are assessed.

Oral peripheral ameloblastoma: A retrospective series study of 25 cases

Background

Peripheral ameloblastoma (PA) is a rare and unusual variant of odontogenic tumor, which was described only in isolated case reports in literature. The objective of this study was to investigate the clinical profile, treatment and outcome of PA in a consecutive case series.

Material and Methods

A total of 25 patients with histologically confirmed PA from 2001 to 2015 were retrospectively reviewed in our institution.

Results

Of the 25 patients, 22 males and 3 females were identified (male: female = 7.3:1). The average age was 48.3 years (range 11-81 years) with lingual or palate gingival region being the most common site (76%). The course of disease was less than 6 months in 92.0% (23/25) of all patients (mean, 3.3 months; range, 1-12 months). All patients underwent complete surgical removal of the lesions, and one lesion recurrence occurred during the follow-up period.

Conclusions

The clinical profile and outcome of PA from Eastern China were elucidated in this retrospective analysis based on a case series. Our experience may provide some insights into the differential diagnosis and clinical management of PA. The first choice of treatment is surgical excision, which can result in a good prognosis.

Key words:Peripheral ameloblastoma, clinical profile, outcome.

Hybrid peripheral ameloblastoma of cheek mucosa

An unusual case of large buccal tumour has been described. The lesion was clinically compatible with a squamous cell carcinoma, but it had pathological features of an ameloblastoma arising in the soft tissues. Only few cases of extragingival peripheral ameloblastoma were found in a review of the literature. Possible origins of these tumours are still debatable.