Figure 3
Magnetic resonance imaging of right hip joint. T2-weighted image (T2WI) of hip joint shows high-intensity area surrounding head of right femur, indicating fluid collection (A). Fat saturated T2WI shows high-intensity area on right obturator externus or adducent muscles (B) that appears as a hotspot on gallium scintigram (C). Synovial fluid contains abundant leukocytes that are phagocytically engulfed by gram-positive cocci (D).