An aggressive, small cell, poorly differentiated thymic neuroendocrine carcinoma, characterized by the presence of a high mitotic rate and numerous apoptotic bodies. The disease is thymus small cell carcinoma (Monarch Disease Ontology id MONDO_0004122). Also known as: Thymus small cell carcinoma, small cell carcinoma of Thymus, small cell carcinoma of the Thymus, small cell carcinoma of thymus, thymic small cell carcinoma, thymic small cell carcinoma neuroendocrine type.