Fig. 17
Osteoid osteoma mimicking anterior impingement. A 29-year-old male presenting with anterior ankle pain for 4 months. CR (a) showed mild sclerosis on the dorsal talar neck (arrow). T1 (b), T2 (c, d, e) and CT (f) showed a mineralized nidus (dotted arrows) with reactional synovitis (arrowhead), bone marrow edema (asterisk) and sclerosis