62-year-old man who presented with pain 1 year after placement of recalled metal-on-metal hip arthroplasty.
A and B, Axial (A) and coronal (B) proton density–weighted fast spin-echo MR images show massive distention of hip pseudocapsule with markedly thickened rind (arrows), dehiscence of lateral margin of posterior capsular repair, and extension into greater trochanteric bursa, consistent with aggressive adverse local tissue reaction.