Adenomatoid Odontogenic Tumour(AOT) in the Posterior Mandible with Unusual Presentation

Abstract

Department of Oral Pathology, Faculty of Dental Sciences, University of Peradeniya, and * Dental Institute, Colombo

The WHO classifies the AOT as an odontogenic tumour, derived from the epithelial components of the developing tooth germ. The recent literature suggests that the odontogenic ectomescenchyme plays a part in the pathogenesis of this turnour. The early cases have been reported as glandular adamantinoma, pseudo-adenoma adamantum or adenoameloblastoma. Philipson named the turnour Adenomatoid Odontogenic Turnour. Some authors however believe that the AOT is a harmatomatous lesion. The AOT accounts for about 0.1% of all turnours and cysts seen in the jaws. It comprises about 3% of all odontogenic turnours.

Case Report: A 13 years old girl presented with pain in relation to the 61. On examination there was pain on percussion and exaggerated response to pulp testing with heated G.P. Radiologically, a radiolucent lesion could be seen in the right side of the mandible extending from 41 to unerupted 8i region. An incisional biopsy was done. The clinical diagnosis was aneurysmal bone cyst. Microscopically , the connective tissue contained many proliferating epithelial islands arranged in the form of islands, cords and knots. There was also evidence of abnormal calcification in the connective tissue. Also the lesion seems to merge with the oral epithelium. Myxomatous tissue with irregular calcification could also be seen.These histopathological features are consistent with that of an AOT in relation to the 876541 region. T he definitive surgery was done and the unerupted 81was removed with the lesion. The patient is being followed up at the Dental Institute, Colombo. What makes this case unusual is summarized below. resent case

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