Thymoma
This thymoma shows predominance of neoplastic epithelial cells with only an occasional thymocyte
(lymphocyte of the thymus). The epithelial cells are mostly round or oval with vesicular nuclei. Thymomas can be
associated with other disorders including myasthenia gravis, Grave disease, and red cell aplasia. They usually
arise in the anterior mediastinum but can occur in other locations along the pathway of embryonal migration.
From the slide collection of the late Dr. Charles Kuhn.