Fig. 4From: Hemosiderin deposition evaluation in hemophilic ankle joints: association between US finding and gradient-recalled echo MR imaging sequenceUS examination at P1 location on the left ankle (a) showed synovial thickening as confirmed by MRI (b). Minimal hemosiderin (red box) is difficult to visualize on the US due to its closed proximity to the thickened synoviumBack to article page