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Premature diagnosis of calciphylaxis without pathological indications finally diagnosed as cutaneous small-vessel vasculitis: a post-mortem case report.

A man in his fifties with diabetes had a past history of myocardial infarction and ventricular septal perforation. He underwent hemodialysis about a year ago and was taking amiodarone. He presented with sores and purpura on the lower limbs.-Skin biopsy showed immunofluorescence-negative leukocytoclastic vasculitis. Skin lesions were treated with ointments, which ameliorated the symptoms to some extent, but ulceration relapsed and deteriorated in both number and size. Calciphylaxis was suspected, and a second skin biopsy was performed. No calcium detection,on the arteries was observed, but leukocytoclastic vasculitis was seen. Antineutrophil cytoplasmic antibody-related vasculitis, cryoglobulin vasculitis, or anti-phospholipid syndrome were ruled out by negative findings for autoantibodies. Although he was treated with 30 mg prednisolone, his systemic condition deteriorated, and he died of disseminated intravascular coagulation. Autopsy findings showed no vasculitis in the lung, kidney or intestine, and perimyocardial patch infection was observed.Although calciphylaxis was clinically suspected, his condition was diagnosed finally as cutaneous small-vessel vasculitis.