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. 2014 May;6(Suppl 2):S228–S237. doi: 10.3978/j.issn.2072-1439.2014.04.19

Table 3. Histologic classification of thymic tumors (WHO, 2004).

Thymoma • Type A, spindle cell; medullary
• Type AB, mixed
• Type B1, lymphocyte-rich; lymphocytic; predominantly cortical; organoid
• Type B2 cortical
• Type B3 epithelial; atypical; squamoid; well-differentiated thymic carcinoma
Micronodular thymoma
Metaplastic, sclerosing, microscopic thymoma
Lipofibroadenoma
Thymic carcinoma • Squamous cell, Epidermoid keratinizing
• Epideromid non-keratinizing
• Basaloid
• Lymphoepithelioma-like
• Mucoepidermoid Ca
• Sarcomatoid
• Clear cell
• Mucoepidermoid
• Papillary
• Undifferentiated
• Combined
Neuroendocrine tumors • Well-differentiated neuroendocrine tumor/carcinomas, including typical and atypical carcinoids
• Poorly-differentiated neuroendocrine carcinomas, including large and small cell neuroendocrine carcinoma