胸きょう腺せん腫しゅMeanings1nounthymomamedicine›Medical term for a tumor originating from the epithelial cells of the thymus.胸きょう腺せん腫しゅは縦じゅう隔かく腫しゅ瘍ようの一ひとつです。Thymoma is one of the mediastinal tumors.