Clinical Findings 2. bleeding (1) manifestation a petechial and purpuric, epistaxis gum bleeding b. menorrhagia, digestive tract urotract bleeding C retina hemorrhage blindness intracranial hemorrhage--deathClinical Findings 2. bleeding： （1）manifestation： a. petechial and purpuric、epistaxis gum bleeding b. menorrhagia、digestive tract、 urotract bleeding c. retina hemorrhage—blindness intracranial hemorrhage--death