患者文，25岁。于1998-04-08背部肿物生长3年来我院就诊。肿物不凸出于皮肤，局部皮肤色泽正常、触诊质硬、有活动性，无痛感；肉眼观察：灰黄红组织1块、质地硬，手术切不，体积ZXIXI（cd）。肿物表面被覆少量纤维脂肪组织，切面实性，粉红色间有黄色颗粒状物。切之质脆，有泥 Patient text, 25 years old. In the 1998-04-08 back tumor growth in our hospital for three years. The tumor does not protrude from the skin, and the local skin is normal in color, palpable in quality, active, and painless. Visual observation: one sallow red tissue, hard texture, and surgical incision, volume ZXIXI (cd). The tumor surface was coated with a small amount of fibrous adipose tissue. The cut surface was solid and there were yellow granules in the pink. The cut is crisp and has mud