Figure 1

Contrast-enhanced T1-weighted magnetic resonance imaging of metacarpophalangeal (MCP) joints 2 and 3 and maximum synovial enhancement of MCP 2. Illustration of contrast-enhanced T1-weighted magnetic resonance imaging of metacarpophalangeal joint 2 and joint 3 (CE-MRI T1), fusion image of CE-MRI T1 and maximum synovial enhancement of MCP 2 measured by dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI), and histological samples from the imaged joint stained with hematoxylin and eosion (HE) or immunohistochemical staining for macrophages (CD68). Patient with (A) a high degree of synovitis and (B) a low degree of synovitis. Red corresponds to a high maximum enhancement.