Thymoma and thymic germinal center.

A previous study of 70 cases of thymoma described in 1966 by the author1 reported that definite germinal centers were found in the normal thymic tissue attached to one case of thymoma associated with myasthenia gravis, and that this was very interesting from the point of view of whether thymoma or thymic germinal center was a more important occurrence of a myasthenic condition. Since then routine histopathological examinations have been directed not only on thymic neoplasms but also on thymic tissues attached to them, so that the relationship between thymomas and thymic germinal centers could be presented on the basis of ten collected cases with this view in mind.