Histological Classification of Tumours of the Thymus -- Definitions and Explanatory Notes -- Epithelial Tumours -- Neuroendocrine Tumours -- Germ Cell Tumours -- Lymphoid Tumours -- Stromal Tumours -- Tumour-Like Lesions -- Neck Tumours of Thymic or Related Branchial Pouch Derivation -- Metastatic Tumours -- Unclassified Tumours -- Illustrations