Fig. 12
Osteoid osteoma versus crystal deposition disease. (a–d) Male, 19 years old, presenting with groin pain for one year. Axial (a) and coronal (b) T2 FS MRI and CT (c) showed a small mineralized nidus (arrows) and reactional bone marrow edema (black asterisk). Percutaneous CT-guided drill excision was performed (d). (e–h) Female, 36 years old, presenting with hip pain for 5 months. Coronal (e) and axial (f) T2 FS and coronal T1 (g) MRI showed calcifications (arrows) close to the indirect head of rectus femoris (arrowheads), which were better characterized on the plain radiograph (h), with reactional bone marrow edema (asterisk)