A squamous cell carcinoma that arises from the mucosal epithelial surface of the maxillary sinus. Patients may present with nasal fullness, obstruction, and/or epistaxis. The disease is Monarch Disease Ontology term MONDO_0004394 (maxillary sinus squamous cell carcinoma). Also known as: epidermoid carcinoma of maxillary antrum, epidermoid carcinoma of maxillary sinus, epidermoid carcinoma of maxillofacial sinus, epidermoid carcinoma of the maxillary antrum, epidermoid carcinoma of the maxillary sinus, epidermoid carcinoma of the maxillofacial sinus, maxillary antrum epidermoid carcinoma, maxillary antrum squamous cell carcinoma.