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Thymus Hyperplasia MeSH Descriptor Data 2023


MeSH Heading
Thymus Hyperplasia
Tree Number(s)
C15.604.816
Unique ID
D013952
RDF Unique Identifier
http://id.nlm.nih.gov/mesh/D013952
Scope Note
Enlargement of the thymus. A condition described in the late 1940's and 1950's as pathological thymic hypertrophy was status thymolymphaticus and was treated with radiotherapy. Unnecessary removal of the thymus was also practiced. It later became apparent that the thymus undergoes normal physiological hypertrophy, reaching a maximum at puberty and involuting thereafter. The concept of status thymolymphaticus has been abandoned. Thymus hyperplasia is present in two thirds of all patients with myasthenia gravis. (From Segen, Dictionary of Modern Medicine, 1992; Cecil Textbook of Medicine, 19th ed, p1486)
Entry Term(s)
Hyperplasia of Thymus Gland
Thymic Hyperplasia
NLM Classification #
WK 400
See Also
Myasthenia Gravis
Date Established
1966/01/01
Date of Entry
1999/01/01
Revision Date
2010/06/25
Thymus Hyperplasia Preferred
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