[Inflammatory dermatosis in adult chronic non-bacterial osteomyelitis (adult CNO) from a dermatological perspective].

Psoriasis vulgaris, palmoplantar pustulosis, acne and hidradenitis suppurativa in various forms are independent dermatological conditions that usually require extensive treatment; however, these dermatological entities also occur coincidentally with the rheumatological diseases of adult chronic non-bacterial osteomyelitis (CNO) and SAPHO syndrome. In the latter case the dermatological entities acne and palmoplantar pustulosis are actually indicative for the diagnosis, for the letters A and P in the acronym SAPHO, even though SAPHO has been used in routine clinical practice without dermatological manifestations. According to the new consensus recommendations, however, SAPHO syndrome is now only listed as a subtype of adult CNO [1]. The similarity of the rheumatological clinical picture of adult CNO to the aforementioned dermatological entities requires a differentiated presentation of the diagnosis, diagnostic classification and interdisciplinary treatment planning from a dermatological perspective, which are presented in this article.