Fig. 13

Osteoid osteoma versus crystal deposition disease [2]. (a–c) Male, 30 years old, presenting with posterior thigh pain for 3 months. Axial T1 (a) and axial (b) and sagittal (c) T2 FS MRI demonstrated a cortical nidus (arrows) and reactional bone marrow edema close to the gluteus tuberosity. Note that the gluteus maximus tendon (dotted arrow) insertion is below the nidus. (d–f) Female, 38 years old, presenting with very intense posterior thigh pain for 2 days. T2 FS axial and coronal MRI (d, e) and plain radiograph (f) showed corticoperiosteal and bone marrow edema in the right gluteus maximus tendon (arrows) insertion and some calcifications (dotted arrows)