Rheopheresis as Adjuvant Treatment of Calciphylaxis

Inclusion Criteria: * Calciphylaxis with at least one ulcerated or necrotizing lesion * End stage renal disease requiring hemodialysis * Weight superior to 30kg * Subject affiliated to or beneficiary of a social security system * Subject having signed written informed consent A patient with progressing calciphylaxis to ulcerate or necrosis despite conventional treatment may also be included. Exclusion Criteria: * KARNOFSKY Performance Status Scale inferior to 30% * Life expectancy (independently of calciphylaxis) estimated \< 6 months according to a referring physician expert in hemodialysis * Uncontrolled infection (persistence of fever despite appropriate antibiotic therapy) * Common variable immunodeficiency * Albumin allergy * Contra-indication to stop anti-vitamin K treatment * Severe cognitive or psychiatric disorders, patients unable to give an informed consent or unwilling to participate in the study * Pregnancy or breastfeeding and all the other categories of people with special protection according to the French Code de la Santé Publique (CSP): patients under legal supervision, patients hospitalized without contentment, patients admitted in social or sanitary structures for care and not research, and patients in emergency situations.