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MRI for H/A; pupil inequality

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31 y/o female with history of headaches x 3 months with increase in frequency the last month from 3-4 days a week to daily. C/O mild left eye mild blurred vision and left eye pupil inequality with H/A. Left pupil dilated additional 1-2 mm in size in comparison. Pupil inequality resolves after 2-3 hours of initial H/A complaint. Are these findings consist with symptoms? Any suggested differential diagnosis? Please explain the interruption.

MRI of the brain Impression:

Focal nodular enlargement of the superior aspect of the pituitary stalk, may be anatomic variation. However, further evaluation is advised with dedicated pituitary MRI protocol.

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