Benign osteoblastoma is a rarely seen tumor of the facial bones. The authors present a case of a 30-year-old man with a tumor of the mandibular body and ramus. The histopathological diagnosis was one of osteoblastoma. Postoperative recurrence with soft tissue infiltration suggested an osteosarcoma radiologically, but the histological examination again revealed the presence of an osteoblastoma. A second recurrence occured in the pharyngo-glossal region and this time the tumor was histologically diagnosed as an osteoblastoma, but with foci of well-differentiated osteosarcoma. The patient was given a course of radiotherapy, but clinical and radiological examination 8 months later revealed lung metastases and chemotherapy was started. Unfortunately, the patient died months later. While osteoblastomas are rare, and their sarcomatous change even rarer, our experience with this case lead us to suggest that a therapeutic preventative approach, involving both chemotherapy and total excision of the tumor, is the regime to adopt with osteoblastomas which involve soft tissues and have radiological features suggesting malignancy.

Foreign body of maxillary sinus have to be differentiated with aspergilosis. Metallic "foreign body" view in maxillary sinus seems to be characteristic sign of aspergillosis. The most often form of maxillary sinus aspergilosis is aspergilloma.

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The study shows better knowledge about oral malignancies in dentists and general praticioners. The tumor patients are surgically treated earlyer as in previous years.

Synovial cysts of the temporomandibular joint (TMJ) are benign, true cystic lesions. Their walls are lined by flattened or cuboidal cells of synovial origin. They contain gelatinous material -a secretion of the cells. The etiology is related to trauma and/or developmental disorder of TMJ. The differentiation includes salivary gland cysts, pharyngeal cysts of branchial origin and tumors of the preauricular area. Diagnostics consists of MR/CT imaging and histopathologic examination. Treatment focuses on complete or incomplete cyst excision. In this report, we describe a case of a 53-year-old female with a synovial cyst in the right TMJ area.