Erdheim-Chester disease in a psoriatic arthritis patient

Data Sharing Statement: The data that support the findings of this study are available from the corresponding author upon reasonable request. Author Contributions: Idea/concept: E.A.K., N.O., G.K.; Design: E.A.K., A.T.; Control/supervision: N.O., A.T., H.S.; Data collection and/or processing: E.A.K.; Materials: E.A.K., G.K. Conflict of Interest: The authors declared no conflicts of interest with respect to the authorship and/or publication of this article.