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Fig. 1 : A line diagram on a sagittal MRI showing the transsphenoidal surgical line of vision. 'A' indicates a tumor tilting forwards with more than 50% of the tumour above the line of vision. 'B' is a tumor that tilts posteriorly and less than 50% of the tumor is above the line of vision.

Fig. 1 : A line diagram on a sagittal MRI showing the transsphenoidal surgical line of vision. 'A' indicates a tumor tilting forwards with more than 50% of the tumour above the line of vision. 'B' is a tumor that tilts posteriorly and less than 50% of the tumor is above the line of vision.