Figure 4.

Magnetic resonance imaging of the right hip with axial T1-weighted sequences (A), T2-weighted sequences using a fat suppression signal (B) and T1-weighted sequences after an intravenous injection of paramagnetic contrast medium (C), showing an area of T1 hypointensity and T2 hyperintensity in the meta-diaphyseal region of the femur with diffuse enhancement via the paramagnetic contrast medium (arrow) and a peri-osteal reaction on the medial face (open arrow). Joint effusion and synovitis (closed arrowhead) are evident. The surgical path (*) can be observed in the lateral margin of the proximal femoral metaphysis for the biopsy site. Intra-osseous collection in the meta-diaphyseal region (open arrowhead) and edema of the iliopsoas muscle belly (curved arrow) are also visible.