A poorly differentiated squamous cell carcinoma characterized by the presence of malignant cells with spindle cell features. The disease is Monarch Disease Ontology entry MONDO_0021663 (sarcomatoid squamous cell carcinoma). Also known as: epidermoid spindle cell carcinoma, spindle cell (sarcomatoid) squamous cell carcinoma, squamous cell carcinoma, sarcomatoid, squamous cell carcinoma, spindle cell, squamous cell spindle cell carcinoma.