Many of the most common triggers of polyarthropathy are detailed in BOX 1. Characteristics in the IMPA subset of polyarthropathies consist of joint inflammation, insufficient an infection or neoplasia directly involving the joints, along with a constructive response to immunosuppressive therapy. This can be even further supported by Impa's reference http://emilianosepir.blogprodesign.com/33703204/new-step-by-step-map-for-impa