Monarch Disease Ontology id MONDO_0044705 (paranasal sinus squamous cell carcinoma) is a squamous cell carcinoma that arises from the mucosal epithelial surface of the ethmoid, frontal, maxillary, or sphenoid sinus. Patients may present with nasal fullness, obstruction, and/or epistaxis. Also known as: epidermoid carcinoma of paranasal sinus, epidermoid carcinoma of the paranasal sinus, paranasal sinus epidermoid carcinoma, squamous cell carcinoma of paranasal sinus, squamous cell carcinoma of the nasal cavity and sinuses, squamous cell carcinoma of the paranasal sinus.