Severe calciphylaxis in a renal patient on long-term oral anticoagulant therapy.

The pathogenesis of calciphylaxis, a potentially life-threatening condition, is not well understood. Several factors such as end-stage renal disease (azotemia), hyperparathyroidism, hyperphosphatemia, hypercalcemia, a high calcium-phosphate product, and the use of steroids and cytotoxic drugs after kidney transplantation are believed to interact in calciphylaxis. Recently, hypercoagulability due to functional protein C deficiency has been suggested to play a pathogenic role in this condition. Here, we present a renal transplant patient, with secondary hyperparathyroidism and on long-term oral anticoagulant therapy, who developed calciphylaxis with severe skin necrosis of her legs. The patient's condition improved dramatically after total parathyroidectomy. Hypercoagulability, therefore, does not appear to have played a significant role in this case of calciphylaxis.