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MR imaging shows an expansile mass involving the T3 left-sided posterior arch and vertebral body, destroying the lamina and pedicle with epidural extension. The mass compresses the cord, pushing it forward and to the right. The tumor has a heterogeneous appearance on both T1 and T2-weighted MR, with focal areas of high T1 signal, presumably representing blood. There are multiple internal septations with enhancement and fluid-fluid levels.
Conclusion: Findings are suggestive of an aneurysmal bone cyst.