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Coronal T1-weighted magnetic resonance (MR) images for radiological invasion of pituitary macroadenoma. Gadolinum-enhanced coronal image (A) shows a homogeneously enhanced intrasellar mass with invasion into the cavernous sinus. Gadolinum-enhanced coronal image (B) shows a homogeneously enhanced intrasellar mass without invasion. In adenomas with invasion, the Ki-67 labeling index was higher than those without invasion.
