A rare, usually aggressive, primary thymic carcinoma, characterized by the presence of tumor cells morphologically resembling soft tissue sarcoma. The disease is thymic sarcomatoid carcinoma (MONDO_0006452, a Monarch Disease Ontology term). Also known as: Thymus sarcomatoid carcinoma, sarcomatoid carcinoma of Thymus, sarcomatoid carcinoma of the Thymus, thymic carcinosarcoma, thymic spindle cell carcinoma, thymus sarcomatoid carcinoma.