RESUMEN
According to the theory of traditional Chinese medicine, 37 patients suffering from myasthenia gravis were Syndrome-differentiated into following types preoperationally: (1) Both Qi-Yin Deficiency of Kidney-Spleen, 21 cases. (2) Yang Deficiency of Kidney-Spleen, 15 cases. (3) Qi Deficiency of Spleen only, one case. Thymectomy were done in all cases. Among them, 19 cases had thymoma. The results showed the relationship between the types and the resectionability rate and post-operative crisis rate. On the first two types, they were 95.2% and 9.5%, 46.7% and 73.3% respectively. It was considered that Syndrome differentiation-typing in TCM in the myasthenia gravis patients would provide an positive and reliable index for predicting the resectionability and prognosis of the patient.