The clinical and thymic histological features of 23 patients who underwent thymectomy for myasthenia gravis have been examined and compared. Eighty-two per cent of patients with a non-neoplastic gland containing numerous germinal centres improved postoperatively, whereas 83% of patients with a non-neoplastic gland containing no germinal centres deteriorated or died. Glands with only slight involution and containing numerous germinal centres were more commonly seen in young female patients. The evidence relating thymic histological appearances with the postoperative progress of patients with myasthenia gravis is reviewed.
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