患者，男，５１岁，１年前发现右手大拇指根部肿物伴轻度酸胀不适感，但活动不受限。查体：右手大拇指根部一稍隆起肿物，大小约３ｃｍ×３ｃｍ，质硬，不能移动，大鱼际处压痛明显，肌肉无萎缩，大拇指内收，外展无异常。化验室检查：血、尿、粪常规检查均正常。Ｘ线检查... The patient, male, 51 years old, had a slight swelling discomfort at the root of his right thumb, but his activity was not limited. Physical Examination: A slightly raised mass in the base of the thumb of the right hand was about 3cm x 3cm in size. It was hard and could not be moved. There was significant tenderness at the canopy, no muscle contractions, and thumb adduction. There was no abnormality in abduction. Laboratory examination: Blood, urine, fecal examination were normal. X-ray inspection...