Proton density weighted turbo spin-echo image of the right Achilles tendon prior to eccentric training in a 45-year-old man with chronic Achilles tendinosis. There is a fusiform thickening of the mid-portion of the Achilles tendon with increased intratendinous signal. The measurement regions of interest were placed in: A = the tendon, B = the fat ventrally of the tendon and C = a vessel.