患者男性,47岁。因浓茶色尿、低热、乏力、纳差、消瘦3个月,并每于站立约20分钟后,发现两下肢皮肤逐渐出现由红色变紫红色状斑纹。近1月来症状加重、头晕、不能久站、四肢无麻木疼痛。病后皮肤无黄染、出血点及皮疹。患者10年前曾因血尿经腹部平片诊为尿路结石。体检:消瘦,面部有蜘蛛痣2个。站立二、三分钟以后,两下肢皮肤渐现红色至紫红色网状斑纹,不高于皮肤,无压痛,压之无明显退色,平卧 Male patient, 47 years old. Due to thick tea urine, fever, fatigue, anorexia, weight loss for 3 months, and each standing about 20 minutes later, the skin of both lower extremities gradually revealed by the red to purple-like markings. Almost a month to aggravate the symptoms, dizziness, can not stand for a long time, limb numbness pain. After the skin no yellow dye, bleeding and rash. 10 years ago he had urinary tract stones because of hematuria and abdominal plain film. Physical examination: weight loss, facial spider nevus 2. Standing two or three minutes later, the skin of both lower extremities gradually red to purple mesh stripes, no higher than the skin, no tenderness, no obvious fade pressure, supine