Non-contrast MR of the knee shows a 2.5 x 1.8 cm T2 hyperintense, T1 intermediate multilobulated mass at the anterolateral proximal right tibial shaft, which appears to arise from the cortex or periosteum. There is T2 hyperintensity within the tibialis anterior muscle surrounding the mass, consistent with intramuscular edema. There is no evidence of significant bone marrow edema of the tibia.