A case of synchronous double primary cancers consisting of squamous cell carcinoma in the maxillary sinus and adenocarcinoma in the nasal cavity.

A 76-year-old man with synchronous multiple primary cancers consisting of squamous cell carcinoma in the maxillary sinus and adenocarcinoma in the nasal cavity is described. Radiographs showed destruction of the medial bony wall of the maxillary sinus and invasion of the nasal cavity by the tumor in the maxillary sinus. After chemotherapy and radiotherapy, a partial maxillectomy and tumor resection were performed. The tumor in the maxillary sinus showed necrosis and had shrunk remarkably. However, the tumor in the nasal cavity was found to be a polyp independent from the antral lesion. Histopathologically, the former was a squamous cell carcinoma and the latter was an adenocarcinoma.