We describe a prostate cancer patient whose initial symptom was intermittent double vision. Intracranial magnetic resonance imaging demonstrated a pituitary mass extending to the cavernous sinus, which caused the double vision. After hormonal therapy for prostate cancer, the pituitary mass disappeared, and double vision was completely resolved without local therapy for the brain. In the 19 months of follow-up after hormone treatment, the prostate cancer remained stable, and the patient remained neurologically intact.

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