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Resolution of acenocoumarol‐associated calciphylaxis with drug withdrawal

Calciphylaxis is a syndrome of cutaneous ischaemic necrosis and ulceration due to arteriolar calcification with subsequent thrombosis, which rarely presents in patients without terminal kidney disease. Recently, several reports of coumarins‐associated calciphylaxis have stressed the relevance of anticoagulant therapy as an important risk factor for the development of this condition. We report five cases of acenocoumarol‐associated, biopsy‐proven calciphylaxis in women aged between 64 and 92 years. The drug had been prescribed for atrial fibrillation and was taken without interruption from 14 to 224 months. Lesions were present for months in all cases and were resistant to multiple therapeutic options, but they resolved only with simple wound care measures 6–14 months after changing the anticoagulant therapy.