Intra-Articular Osteoid Osteoma Mimicking Juvenile Arthritis

Figure 4

Same patient as in Figure 3. (a–c) MRI of the left ankle demonstrates the talar neck nidus, surrounded by abundant oedema and synovial inflammation ((a) sagittal T1-WI, (b) sagittal T2-WI, and (c) axial fat saturated PD-WI). (d) CT-scan of the left ankle also demonstrates the talar neck nidus.

(a)

(b)

(c)

(d)