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The rounded, somewhat heterogeneous, mass is located within the third ventricle, best seen on sagittal T1 imaging where the depression of the floor of the third ventricle and relationship to the optic chiasm can be clearly seen.
The mass is of somewhat lower T1 signal, high T2 signal and vividly enhancement with facilitated diffusion and no calcification, but speckled blood product at the periphery.
Conclusion:
The third ventricular mass has a differential diagnosis of papillary craniopharyngioma, chordoid glioma, choroid plexus papilloma (unusual location) and ependymoma (unusual location).