Fig. 10

Aneurysmal bone cyst. MRI imaging in the same patient as Fig 9. Pre-contrast axial T1-weighted image (a) confirms fluid-fluid levels within the lesion (orange arrows), indicating hemorrhage with sedimentation of varying stages of blood products. Post-contrast axial T1-weighted image (b) demonstrates enhancement of the septa within the lesion (orange arrows). Note a partially hypointense rim, representing cortex (white arrow). Axial T2-weighted image (c) re-demonstrates a destructive lesion with fluid-fluid levels (orange arrows); varying signal intensity corresponds to differing stages of blood product degradation