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Dynamic contrast-enhanced MRI of the Achilles tendon. (a) Pre-contrast and (b) post-contrast sections from a three-dimensional dynamic series showing enhancement of the tendon (arrow), retrocalcaneal bursa and adjacent bone in a patient with spondyloarthritis. (c) Enhancement curves comparing a normal Achilles tendon (dashed line) with a tendon from a spondyloarthritis patient (solid line). The tendon from the patient shows much greater, rapid enhancement.
