- thymoma
- A neoplasm in the anterior mediastinum, originating from thymic tissue, usually benign, and frequently encapsulated; occasionally invasive, but metastases are rare; histologically, consists of any type of thymic epithelial cell as well as lymphocytes that are usually abundant. Malignant lymphoma that involves the thymus, e.g., Hodgkin disease, should not be regarded as t.. [thymus + G. -oma, tumor]
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thy·mo·ma thī-'mō-mə n, pl -mas also -ma·ta -mət-ə a tumor that arises from the tissue elements of the thymus* * *
n.a benign or malignant tumour of the thymus. It is sometimes associated with myasthenia gravis, a chronic disease in which muscles tire easily. Surgical removal of the tumour may result in improvement of the muscle condition, but the response is often slow.* * *
thy·mo·ma (thi-moґmə) [thymo-1 + -oma] a tumor derived from the epithelial or lymphoid elements of the thymus.
Medical dictionary. 2011.