Studying of the clinical characteristics and image thoracic CT with mediastinal gas pump in 45 patients with myasthenia gravis have an average age of 43.91 + or - 8.56
female/male is 2/1, percentfound: - The common symptoms onset are fall eyelids (82.22 percent), diplopia (64.43 percent), weak legs (68.88 percent) and dyspnea (11.11 percent). - The common clinical manifestations are fall eyelids (84.44 percent) (level II and III), diplopia (75.55 percent), dysphagia, choke, choking (73.33 percent), chewing fatigue (55.55 percent), said difficult (33.33 percent), weak legs (68.88 percent). The Osserman typs are group I (24.44 percent), IIa (24.44 percent), IIb (51.11 percent), mild level (48.88 percent) and medium level is 51.12 percent. - Chest CT Scan result with mediastinal gas pump shows the percentage of patients with abnormal thymus is 73.34 percent: the thymus is abnormally large (11.11 percent), thymus gland tumors (62.22 percent). The rate of thymus gland tumors of the group IIa and IIb are 72.73 percent and 73.91 percent.