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A case of peripheral ameloblastoma in the anteromedial part of the mandibular ramus

2013; Japanese Society of Oral and Maxillofacial Surgeons; Volume: 59; Issue: 9 Linguagem: Inglês

10.5794/jjoms.59.583

2186-1579

Atsushi Kasamatsu, Tomoyoshi Koyama, Hirofumi Koike, Yosuke Sakamoto, Katsuhiro Uzawa, Hideki TANZAWA,

Bone Tumor Diagnosis and Treatments

Peripheral ameloblastoma is an uncommon variant of ameloblastoma occurring in the extraosseous region, which accounts for only 1 % to 5 % of all types of ameloblastomas. The most frequent sites of peripheral ameloblastoma are the upper and lower gingiva, but the anteromedial part of the mandibular ramus is not a common site of this tumor. We report a case of peripheral ameloblastoma arising in the anteromedial part of the right mandibular ramus of a 59-year-old woman who noticed a painless mass during swallowing. Computed tomographic and magnetic resonance images showed a well-circumscribed mass in the anteromedial part of the mandibular ramus. We performed an excisional biopsy with a rim of surrounding normal tissue under general anesthesia. Histopathologically, the mass was diagnosed as a plexiform type peripheral ameloblastoma. There was no evidence of recurrence at 45 months of postoperative follow-up.