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Fig 6. Case 17, a 58-year-old man, whose disease duration from the initial examination to the operation was 26 months. VA was not stable, though fixed VA disturbance was not recognized on the initial examination. A, Pituitary adenoma compressed the optic chiasm. B, Hyperintensiy of the optic nerve was not shown (arrows) on the initial examination. C, Right-side perioptic subarachnoid space dilated slightly on the initial examination (arrow). D and E, Tumor reduction was performed 26 months after the initial examination. Hyperintensity was shown in the bilateral optic nerve ventral to the optic chiasm (D, white arrows) and bilateral perioptic subarachnoid space dilated markedly (E, white arrows), probably representing atrophic change of the optic nerves.
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