A malignant epithelial neoplasm arising in the paranasal sinus. The disease is paranasal sinus carcinoma (Monarch Disease Ontology term MONDO_0000380). Also known as: accessory sinus cancer, accessory sinus carcinoma, cancer of paranasal sinus, carcinoma of accessory sinus, carcinoma of paranasal sinus, carcinoma of the accessory sinus, carcinoma of the paranasal sinus.