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Intraoperative MRI for identifying residual tumor. This is a 73-year-old woman with a non-secretory pituitary adenoma. A Pre-operative coronal sequences show a hypo-enhancing pituitary lesion with invasion into the cavernous sinus (red arrow). B After initial resection, intraoperative MRI demonstrates a small, hypo-enhancing residual in the cavernous sinus (red arrow) that was subsequently removed (C, red arrow)
