Intravenous treatment of calcinosis cutis with sodium thiosulfate - A case series

Calcinosis cutis is defined as the deposition of calcium salts in the skin. The dystrophic form is the most common and usually occurs in chronic inflammatory processes associated with collagenoses. Therapeutic options include surgical excision as well as a few pharmacological treatments. Overall, the evidence for the known therapeutic interventions is very limited and there is a lack of valid recommendations. Intravenous sodium thiosulfate has been used successfully in the treatment of calciphylaxis. In our case series, five patients with dystrophic calcinosis cutis received intravenous sodium thiosulfate for at least six cycles on five consecutive days per month, with single doses of 12.5 g and 25.0 g, respectively. A reduction in the calcified lesions could not be proven with certainty, but stable disease conditions were achieved. Intravenous sodium thiosulfate may counteract the progression of calcinosis cutis. The successful use of epicutaneously applied sodium thiosulfate, as described in the literature, suggests that a higher cutaneous bioavailability can be achieved to exert a lytic effect on calcinosis cutis. This is further supported by the reported efficacy of high-dose sodium thiosulfate in the treatment of calciphylaxis.