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A 71-year-old female patient presented with a 21.2-mm nonenhancing intrasellar cystic lesion. The lesion was located in the midline on a coronal contrast-enhanced T1-weighted image (A), and a fluid-fluid level (B) and septation (C) were seen on sagittal and coronal T2-weighted images. This lesion was classified as a cystic pituitary adenoma on the basis of the diagnostic tree model and was finally diagnosed by histopathology as a pituitary adenoma.
