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O ameloblastoma e considerado o tumor odontogenico clinicamente mais comum, segundo Neville. Tem origem epitelial odontogenica, podendo surgir dos restos da lâmina dentaria de orgao de esmalte em desenvolvimento, das celulas basais da mucosa oral e do revestimento epitelial de um cisto odontogenico. Sao tumores de crescimento lento, porem invasivos e nao possuem predilecao por genero. O objetivo deste estudo e relatar um caso de ameloblastoma solido em um paciente de 12 anos apresentado ao servico de Cirurgia Oral e Maxilofacial no Hospital Federal dos Servidores do Estado com historia de mudanca de posicao e mobilidade da porcao anterior dos dentes mandibulares e aumento do volume de sinfise. A analise da radiografia panorâmica revelou uma grande lesao radiolucida e unilocular, que se estende do dente 34 ao dente 45, sugerindo o diagnostico de ameloblastoma unicistico. A tomografia computadorizada mostrou uma lesao expansiva com substancial perda ossea cortical. A biopsia foi realizada e o histopatologico revelou que se tratava de um ameloblastoma solido com padrao plexiforme. O tratamento de escolha foi excisao e ostectomia periferica. O paciente teve um acompanhamento de cerca de 8 anos sem recorrencia. Palavras-chaves: Tumor odontogenico, Ameloblastoma, Ameloblastoma solido, Cirurgia, Tratamento conservador, Paciente pediatrico. ABSTRACT Ameloblastoma is considered the clinically most common odontogenic tumor, according to Neville. It has an odontogenic epithelial origin, and may arise from the remains of the dental enamel organ in development, the basal cells of the oral mucosa and the epithelial lining of an odontogenic cyst. They are slow-growing tumors, but they are invasive and have no predilection for gender. The aim of this study is to report a case of a solid ameloblastoma in a 12-year-old presented to the Oral and Maxillofacial department at HFSE (Hospital Federal dos Servidores do Estado) with a history of change in position and mobility of the anterior mandibular teeth and increased volume of symphysis. Panoramic radiograph analysis revealed a large radiolucent and unilocular lesion, extending from the element 34 to the element 45, suggesting the diagnosis of unicystic ameloblastoma. Computed tomographic scan showed an expansive lesion with substantial cortical bone loss. A biopsy was performed and the histopathological be revealed solid ameloblastoma of plexiform type. The treatment of choice was excision and peripheral ostectomy. This patient had a follow up about 8 years without recurrence. Key words: Odontogenic tumor, Ameloblastoma, Solid ameloblastoma, Conservative Treatment, Pediatric patient.

TRATAMENTO CONSERVADOR DE AMELOBLASTOMA SÓLIDO DE GRANDE EXTENSÃO EM PACIENTE PEDIÁTRICO: RELATO DE CASO