Ultrasonographic picture of second metatarsophalangeal joint with synovitis (panel A) and without synovitis (panel B). a, metatarsal head; b, base of phalanges; c, joint capsule (side view); d, synovitis; e, joint effusion. Ultrasonographic picture of second metatarsophalangeal joint with synovitis (panel A) and without synovitis (panel B). a, metatarsal head; b, base of phalanges; c, joint capsule (side view); d, synovitis; e, joint effusion. M-A D’Agostino et al. Ann Rheum Dis 2004;63:1284-1287 ©2004 by BMJ Publishing Group Ltd and European League Against Rheumatism