Site of origin of paranasal sinus malignancies

: In a group of 124 patients a site of origin of paranasal sinus and nasal cavity malignancies was evaluated on the basis of computed tomography (CT) and on the basis of operative findings. The most common malignant tumor was squamous cell carcinoma (41, 1%) and then cancers of salivary origin (20, 2%). The most common site of origin was the maxillary sinus (53, 2%) and then the nasal cavity (31, 5%). Within the maxillary sinus the most frequent neoplasm was cancer whereas in the nasal cavity melanoma and olfactory neuroblastoma. In three (2, 4%) patients site of tumor origin demonstrated on CT was different form that of operative finding.