Osteoma is a benign neoplasm characterized by slow growth and can be composed of spongy or compact bone. Its symptomatology is directly related to the location, size, and proximity to adjacent structures. Histologically, it is classified as compact, cancellous, or mixed. Although rarely found in the gnathic bones, they are more frequently observed in the paranasal sinuses. This study aims to report a case of osteoma located in the maxillary sinus of a male patient, describing the surgical management performed in a hospital setting. The patient, a 49-year-old male with no systemic diseases, underwent surgical procedure under general anesthesia, including intraoral access, excision of the lesion, and subsequent fixation of the bone fragment. After six months of postoperative follow-up, no recurrences were observed. It is concluded that the definitive treatment of osteoma requires adequate correlation of the clinical picture, selection of the best type of surgical access, consideration of the location, and choice of the most appropriate synthesis method to promote a good prognosis.

Fibro-bone lesions (LFO) are defined as a group of lesions characterized by the replacement of normal bone tissue with fibrous connective tissue, of variable cellularity, permeated by a variable amount of mineralized material, whose microscopic appearance may resemble bone, cement or a mixture of both. Among the injuries that make up this group, we can mention: fibrous dysplasia, ossifying fibroma, bone dysplasia and cemento-bone dysplasia. In this case report, we presented a mandibular reconstruction with free autogenous graft from the iliac crest, with the use of stereolithography prototyping, after the surgical treatment of a cemento-ossifying fibroma, as well as to describe the clinical, epidemiological, radiographic characteristics, and histological, the differential diagnosis and the form of treatment of the referred pathology.