“…Hence, both of these known cases showed the typical traits described in the clinical literature: erosive polyarticular symmetric lesions affecting the hand and wrist bones as well as other more distant joints (here, the elbows). These traits are recognized characteristics of RA (2,(7)(8)(9)15,18,19,21,23,24,27,28,38) and used in the differential diagnosis of previous studies (26,31,46,53,54). Moreover, they both lacked the same features that would have indicated other diseases included in the differential diagnosis: sacroiliac fusion, spinal fusion, asymmetric involvement, fibrocartilaginous entheses, oligoarthritis, DIP joints involvement, and bone debris.…”