[Thymolipoma revelated by myasthenia].

Thymolipomas are rare, often asymptomatic benign tumors; their revelation by myasthenia is exceptional. A 49-year-old patient with a one-year history of fluctuant muscular fatigability developed ptosis. Electromyography revealed a myasthenic neuromuscular block. The CT scan disclosed a thymic mass especially important on the left side. Thoracotomy under left mammary was performed for thymectomy. Pathology examination of the surgical specimen provided the diagnosis of benign thymolipoma. At 37 months follow-up, the myasthenia has remained unchanged.