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Rathke cleft cyst in a 59-year-old woman.
A. Sagittal T1-weighted MR image (600/15) depicts a well-defined, homogeneous high signal intensity mass (arrows) in the sella turcica and extending into the suprasellar cistern.
B. Axial T2-weighted (3500/99) MR image indicates that the mass is isointense relative to gray matter (arrows), reflecting the high protein concentration of the cystic fluid. A Rathke cleft cyst was pathologically proven.
