Fig. 1
From: Ultrasound and its clinical use in rheumatoid arthritis: where do we stand?
Imagens of a normal MCP joint and an abnormal MCP joint of a RA patient. a Normal musculoskeletal ultrasound (MSUS) of third metacarpophalangeal (MCP) joint, longitudinal dorsal aspect; b Synovial proliferation grade 3 on second MCP, longitudinal dorsal aspect (arrow in hypoechoic area); c Synovial proliferation (arrow) and power Doppler (pD) captation grade 2 on second MCP, longitudinal dorsal aspect; d Interruption of cortical bone (erosion) on second MCP, radial aspect, longitudinal scan (plus sign); e MSUS of a patient with long-standing rheumatoid arthritis. Findings of second MCP (longitudinal dorsal aspect) include synovial proliferation grade 3 (arrow), pDcaptation grade 2 and bone erosion (plus sign)