病例 男，３３岁，右腘窝肿块逐渐增大，伴轻微胀痛不适２年余，近来觉屈膝受限，患肢无发热、剧痛、麻木、肿胀，既往无外伤史。体检：右下肢外观无畸形，无肌萎缩，行走无跛行，于右腘窝部可见 ７ｃｍ×１２ｃｍ局限性隆起，肿块质硬不活动，周边清楚，患肢血运良好。实验室? Case Male, 33 years old, with enlarged right axilla mass, with slight discomfort for more than 2 years, recently felt knee flexion limited, limb without fever, severe pain, numbness, swelling, no previous history of trauma. Physical examination: The appearance of the right lower extremity was not deformed, no muscle atrophy, no walking was performed, and 7 cm × 12 cm localized uplift was seen in the right axilla. The mass was hard and inactive, and the periphery was clear. The blood supply to the affected limb was good. laboratory?