Fig. 1. The magnetic resonance image (coronal and sagittal T₁ and fast short-tau inversion-recovery [FSTIR] images) of the patient's right ankle shows an intra-articular well-defined localized mass in the anterolateral ankle joint and sinus tarsi without bony infiltration. The mass has an intermediate density T₁ signal and a mildly high FSTIR signal, and it distends the ankle joint locally. On the gradient-echo images, blooming indicated hemorrhage and iron deposition.