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A large, lobulated mass arising from the sacrum, with soft-tissue extension anteriorly, posteriorly, and into the sacral epidural space.
On T1WI it's isointense relative to that in muscle, with scattered areas of hyperintensity signify hemorrhage or mucinous material. On T2WI the mass has heterogeneous high signal intensities with areas of low signal intensity. Some of the areas of low signal intensity corresponded to areas of high signal intensity on T1-weighted images. There is abnormal high signal intensity the lower sacral segments and in the coccyx.
On STIR, the lesion is markedly heterogeneously hyperintense.
Imaging features are most likely represent sacral chordoma.