This classification represents a project aimed at bringing together the
variety of ways thymic epithelial neoplasms have been classified. It
focuses on their growth characteristics, and cytoarchitectural features
. The classification, though restricted to the thymic region rather than
the mediastinum in general, also covers neuroendocrine, germ cell,
lymphoid, and stromal tumours, as well as tumour-like lesions and the
neck tumours of thymic or related branchial pouch derivation.