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Fig. 2A —Postsurgical marrow edema outside osteomyelitis tract in 15-month-old boy with no evidence of osteomyelitis. T2-weighted sagittal (A) and proton density–weighted axial (B) fat-saturated images of distal tibia show round focal area of edema (arrows) consistent with anterior aspiration. When surgical approach for marrow aspiration is known, imaging findings can be attributed to intervention and not to early hematogenous osteomyelitis. This patient's final diagnosis was septic arthritis without concomitant osteomyelitis.