Abstract
Maxillary sinus carcinoma occurs most frequently after maxillary gingival cancer. However, malignant tumors arising from cysts are rare. We report a case of maxillary sinus carcinoma, which was thought to have occurred from dentigerous cysts. The patient was a woman in her 30s. From around February 2016, she experienced pain and gingival swelling of the right maxillary molar region and consulted a local doctor. Impacted teeth were found in the maxillary sinus, and she was referred to our hospital with suspected tooth cysts. In the past, she had undergone CT imaging in an examination for brain tumors, and cystic lesions and impacted teeth had been found in the right maxillary sinus. As an intraoral finding, a tumor was found in the right maxillary molar tooth; a biopsy was performed and malignant findings were confirmed. A contrast CT examination revealed extensive expansion of the tumor and impacted teeth in the tumor. Under a diagnosis of maxillary sinus carcinoma, complete resection of the maxilla and reconstruction of the rectus abdominis flap were performed in June 2016. The patient was diagnosed with squamous cell carcinoma by pathological diagnosis. After the surgery, radiotherapy was administered, however, the patient passed away in October 2016. Oncogenesis of an odontogenic cyst is rare, and we suggest that if such a cyst is recognized, early treatment and regular follow-up for a long period after surgery are necessary.
