NCIt definition : A thymoma that has an aggressive clinical course (capsular invasion, infiltration
of the surrounding tissues) and can metastasize. Although any morphologic subtype
of thymoma may eventually have a malignant clinical course, this term is most often
associated with thymoma types B3 and C.;
Alternative definition : CDISC: A malignant neoplasm of the thymus, originating from epithelial thymus cells.;