Bone cortex defect (arrows) on ultrasonography in a 63-year-old healthy control person on the radial side of the 3rd proximal interphalangeal joint in a longitudinal view

Copyright information:Taken from "Ultrasonography, magnetic resonance imaging, radiography, and clinical assessment of inflammatory and destructive changes in fingers and toes of patients with psoriatic arthritis"http://arthritis-research.com/content/9/6/R119Arthritis Research & Therapy 2007;9(6):R119-R119.Published online 14 Nov 2007PMCID:PMC2246238. The corresponding transverse view. The coronal T1-weighted magnetic resonance image without contrast administration reveals no erosion-like changes in the same person at the corresponding site (arrows). IP, intermediate phalanx; PP, proximal phalanx.