A right lower femoral shaft metadiaphyseal osteolytic exophytic lesion is seen showing a wide zone of transition with the adjacent normal bone marrow and encasing the postero-lateral circumference of the distal femoral shaft. The lesion elicits inhomogenous isointense T1 / T2 and high STIR signals with internal break-down foci of fluid signal. The lesion causes cortical destruction with and extra-osseous eccentric soft tissue component measuring 9.1 X 8 X 7.7 cm in orthogonal dimensions. The lesion and the soft tissue component show heterogeneous contrast enhancement.
The quadriceps femoris (mainly the vastus lateralis mucle) shows signal changes and post-contrast enhancement similar to the lesion and and appears stretched over the lesion.
No other lesions in the scanned bones or invasion of the popliteal neurovascular bundle.