Katya Pulido Díaz

Bilateral central ossifying fibroma affecting the mandible: report of an uncommon case and critical review of the literature

Ossifying fibroma (OF) is a well demarcated benign neoplasm primarily found in the jaw and composed of fibrocellular tissue and mineralized material. Occurrence of multiple OFs (synchronous) is rare in the jaws, and only 10 cases have been documented. The aim of this report was to present an additional case of bilateral central OF in the mandible of a patient not affected by the hyperparathyroidism–jaw tumors syndrome (HPTJT), emphasizing the features that distinguish this lesion from HPT-JT and performing a critical review of the current literature and concepts. Benign fibro-osseous lesions (FOLs) are a poorly defined and to some extent controversial group of lesions affecting the jaws and craniofacial bones. FOL refers to a group of pathologic processes in which normal bone is replaced by fibroblasts and collagen fibers containing variable amounts of mineralized material. This group encompasses fibrous dysplasia, benign fibro-osseous neoplasms (central ossifying fibroma), and a heterogeneous group of reactive lesions (osseous dysplasias). Because of the histopathologic similarities among these lesions, the definitive diagnosis requires a precise correlation of the clinical, histopathologic, and imaging findings.

Nodular lesion in the anterior hard palate

CLINICAL PRESENTATION A 13-year-old boy was referred to the Oral Diagnosis Clinic (Orocentro—Piracicaba Dental School, University of Campinas, Sao Paulo, Brazil) for evaluation of an asymptomatic oral swelling that had been present for 7 years. According to his father, the swelling had suddenly grown recently. The clinical examination showed a well delimited bilobulated nodular lesion on the anterior region of the right-sided hard palate that measured about 2.0 1.5 cm and was nontender and firm on palpation (Figure 1). A small ulcer was noticed on the anterior lobe, probably due to contact with the lower teeth. There was no report of local trauma, the patient presented no parafunctional habits, and the medical history was noncontributory. In addition, there was no mobility of the teeth, and no radiographic changes were seen.

Extranodal Rosai-Dorfman Disease Involving Maxilla

MARTINS, ANTONIO MARCIO MARCHIONNI, ALENA PEIXOTO MEDRADO, SILVIA REGINA ALMEIDA REIS. ESCOLA BAHIANA DE MEDICINA E SAÚDE PÚBLICAPPGO MESTRADO EM ESTOMATOLOGIA. Dermoid cyst is often used to describe three closely related histologic cysts, but dermoid, epidermoid, and teratoma cysts are considered rare in the floor of the mouth. Epidermal cysts seldom occur in the head and neck region compared to dermoid cysts, and when they do occur, they involve the floor of the mouth. Histologically, all dermoid cysts are lined by epidermis. Cyst lining content determines the histological categories of these cysts. They are epidermoid if epidermis lines the cyst, dermoid if skin annexes exist, and teratoid if tissues are derived from the three germinal layers. Anatomical classification helps determine whether the surgical approach should be intraoral or extraoral. This report presents a case of dermoid cyst of the floor of the mouth. The cyst was excised and confirmed histopathologically. The patient’s clinical course and recovery after surgery were uneventful, and no recurrence developed postoperatively.