患者 男， 32岁。因右颈部包块无痛性进行性肿大 2年余，伴右肩、右上臂酸痛 2月余，于 1999年 7月入院。患者于 1997年 4月间无意中发现右颈部胸锁乳突肌中部肿块，约蚕豆大小，无任何不适。 1997年 7月在当地医院曾考虑进行肿块切除术，但术中因出血严重改行肿块活检术，病理 Male patient, 32 years old. Due to the right neck mass painless progressive swelling more than 2 years, with the right shoulder, right upper arm pain more than 2 months, in July 1999 admitted. Patients inadvertently in April 1997 found the right neck sternocleidomastoid central mass, about the size of broad beans, without any discomfort. July 1997 was considered in the local hospital for tumor resection, but due to serious bleeding during the operation block biopsy, pathology