Figure 1From: Ultrasonography of the metacarpophalangeal and proximal interphalangeal joints in rheumatoid arthritis: a comparison with magnetic resonance imaging, conventional radiography and clinical examinationSigns of destruction on ultrasonography in the fourth proximal interphalangeal joint: early RA. MRI and conventional radiography revealed no signs of destruction in the joint. A bone erosion (arrow) is visualized with ultrasonography in (a) the longitudinal and (b) the transverse planes. MRI, magnetic resonance imaging; RA, rheumatoid arthritis.Back to article page