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Thymomas and thymic carcinomas. 1990

A N Walker, and S E Mills, and R E Fechner
Department of Pathology, Mercer University School of Medicine, Macon, GA.

This review discusses epithelial proliferations of the thymus, excluding carcinoid tumor and small cell carcinoma. The clinical features of thymoma, possible etiologic mechanisms, and associated autoimmune and paraneoplastic conditions are summarized briefly. Histologic subtypes of thymoma, including lymphocyte predominant, mixed, and spindle cell tumors are described and illustrated. The concept of "medullary" and "cortical" differentiation in thymoma is reviewed. Immunohistochemical and electron microscopic features of this neoplasm are presented. Flow cytometric studies relating to its prognosis also are summarized. Distinctions between encapsulated thymoma, invasive thymoma, and metastatic or "malignant" thymoma are described in detail. Thymic carcinomas are reviewed, as distinguished from cytologically bland thymomas. Variants of thymic carcinoma include squamous cell, spindle cell, lymphoepithelioma-like, mucoepidermoid, adenosquamous, clear cell, basaloid, and adenoid cystic neoplasms.

UI MeSH Term Description Entries
D008479 Mediastinal Neoplasms Tumors or cancer of the MEDIASTINUM. Cancer of Mediastinum,Mediastinal Cancer,Cancer of the Mediastinum,Mediastinum Cancer,Mediastinum Neoplasms,Neoplasms, Mediastinal,Cancer, Mediastinal,Cancer, Mediastinum,Cancers, Mediastinal,Cancers, Mediastinum,Mediastinal Cancers,Mediastinal Neoplasm,Mediastinum Cancers,Mediastinum Neoplasm,Neoplasm, Mediastinal,Neoplasm, Mediastinum,Neoplasms, Mediastinum
D008854 Microscopy, Electron Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen. Electron Microscopy
D002277 Carcinoma A malignant neoplasm made up of epithelial cells tending to infiltrate the surrounding tissues and give rise to metastases. It is a histological type of neoplasm and not a synonym for "cancer." Carcinoma, Anaplastic,Carcinoma, Spindle-Cell,Carcinoma, Undifferentiated,Carcinomatosis,Epithelial Neoplasms, Malignant,Epithelioma,Epithelial Tumors, Malignant,Malignant Epithelial Neoplasms,Neoplasms, Malignant Epithelial,Anaplastic Carcinoma,Anaplastic Carcinomas,Carcinoma, Spindle Cell,Carcinomas,Carcinomatoses,Epithelial Neoplasm, Malignant,Epithelial Tumor, Malignant,Epitheliomas,Malignant Epithelial Neoplasm,Malignant Epithelial Tumor,Malignant Epithelial Tumors,Neoplasm, Malignant Epithelial,Spindle-Cell Carcinoma,Spindle-Cell Carcinomas,Tumor, Malignant Epithelial,Undifferentiated Carcinoma,Undifferentiated Carcinomas
D004848 Epithelium The layers of EPITHELIAL CELLS which cover the inner and outer surfaces of the cutaneous, mucus, and serous tissues and glands of the body. Mesothelium,Epithelial Tissue,Mesothelial Tissue,Epithelial Tissues,Mesothelial Tissues,Tissue, Epithelial,Tissue, Mesothelial,Tissues, Epithelial,Tissues, Mesothelial
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D013945 Thymoma A neoplasm originating from thymic tissue, usually benign, and frequently encapsulated. Although it is occasionally invasive, metastases are extremely rare. It consists of any type of thymic epithelial cell as well as lymphocytes that are usually abundant. Malignant lymphomas that involve the thymus, e.g., lymphosarcoma, Hodgkin's disease (previously termed granulomatous thymoma), should not be regarded as thymoma. (From Stedman, 25th ed) Carcinoma, Thymic,Carcinomas, Thymic,Thymic Carcinoma,Thymic Carcinomas,Thymomas
D013953 Thymus Neoplasms Tumors or cancer of the THYMUS GLAND. Cancer of Thymus,Thymus Cancer,Thymus Tumors,Cancer of the Thymus,Neoplasms, Thymic,Neoplasms, Thymus,Thymic Cancer,Thymic Neoplasms,Thymic Tumors,Cancer, Thymic,Cancer, Thymus,Cancers, Thymic,Cancers, Thymus,Neoplasm, Thymic,Neoplasm, Thymus,Thymic Cancers,Thymic Neoplasm,Thymic Tumor,Thymus Cancers,Thymus Neoplasm,Thymus Tumor,Tumor, Thymic,Tumor, Thymus,Tumors, Thymic,Tumors, Thymus

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