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Japanese Journal of Clinical Oncology, Vol 28, Issue 11 696-701, Copyright © 1998 by Foundation for Promotion of Cancer Research

ORIGINAL ARTICLE

Pure red cell aplasia and myasthenia gravis with thymoma: a case report and review of the literature

S Mizobuchi, T Yamashiro, Y Nonami, A Yamamoto, M Kume, H Nakaya, T Sawada, H Taguchi, T Moriki and S Ogoshi
Department of Surgery II, Kochi Medical School, Japan. vyg10377@niftyserve.or.jp

A case of pure red cell aplasia (PRCA), myasthenia gravis (MG) and thymoma is reported. A 70-year-old woman presented with severe anemia. She had been diagnosed as having MG 8 years earlier and her symptoms were adequately controlled with ambenonium chloride. When she visited our hospital, her hematocrit was 13.7% with a hemoglobin concentration of 4.7 g/dl and her reticulocyte counts were persistently abnormal at 0.1%. Although both direct and indirect Coombs' tests were positive, there was no evidence of hemolysis. Routine screening tests for other etiologies of anemia were negative. Serological tests for anti-DNA and anti-acetylcholine receptor antibodies gave positive results. A bone marrow examination revealed severe erythroid hypoplasia. PRCA was diagnosed and the patient was treated with periodic transfusions. A lateral view chest roentgenogram and a computed tomography scan of the thorax showed the presence of an anterior mediastinal mass which was suspected to be thymoma. The patient underwent thymothymectomy and the tumor was diagnosed as a thymoma. Although the patient received no treatment for MG and PRCA after surgery, her hematological test results rapidly improved and she was discharged from the hospital on the 29th postoperative day. At that time, her hematocrit was 33.2%, her hemoglobin concentration was 10.0 g/dl, her peripheral reticulocyte level was 1.8% and her left partial ptosis had improved. She is doing well, 9 months after surgery. For a patient to remain in remission without treatment for PRCA and MG after thymothymectomy is extremely rare.
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T.-t. Kuo and L.-Y. Shih
Histologic Types of Thymoma Associated with Pure Red Cell Aplasia: A Study of Five Cases Including a Composite Tumor of Organoid Thymoma Associated with an Unusual Lipofibroadenoma
International Journal of Surgical Pathology, January 1, 2001; 9(1): 29 - 35.
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