一、病历摘要患者男，19岁。在腋下无痛性包块4个月。查体：左腋下触及核桃大小包块，质地较硬，固定，无压痛。其余器官及血常规检查无异常。手术切除包块。二、病理检查送检组织一块，大小约2cm×2cm×1cm。切面界限不清，无包膜，质硬，灰白色，可见点状坏死。光镜下肿瘤细 First, the medical record summary patient male, 19 years old. Painless mass in the armpit for 4 months. Physical examination: The left armpit touched the walnut mass, hard texture, fixed, no tenderness. Other organs and blood tests were normal. Surgical removal of mass. Second, pathological examination sent a piece of tissue, the size of about 2cm × 2cm × 1cm. Section boundaries are unclear, non-enveloped, hard, gray, and spotty necrosis. Light microscope under the tumor fine