Abstract

A large asymptomatic anterior mediastinal thymolipoma, discovered by chest radiograph during a regular check-up for company employees, was excised from a 33-year-old Japanese man. On immunohistochemical and electron-microscopic examination, clusters of myoglobin-positive cells with cytoplasmic Z band structures were found scattered in the medulla. Myoid cells have been previously seen in the normal thymus as well as in thymic hyperplasia, thymoma, and in the thymus of patients with myasthenia gravis. To our knowledge, this is the first reported instance of myoid cells in a thymolipoma.

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