[A case report of thymolipoma with high titer of serum anti-acetylcholine receptor antibodies--thymolipoma, a review of 49 reports in Japan].

A 22-year-old man was diagnosed as thymolipoma by chest CT scan & MRI. In spite of high titer of serum anti-acetylcholine receptor antibodies, he showed no symptom of myasthenia gravis. An extended thymectomy was done successfully. Tumor was 21 x 15 cm in size and 620 g in weight. Histopathologically the tumor was diagnosed as thymolipoma. The titer of serum anti-acetylcholine receptor antibodies was decreased within normal limit and postoperative course was uneventful. To our knowledge, the 49 case reports in Japan were reviewed.