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Localized treatment has recently become an option for treating oligometastatic prostate cancer. Metastasis-directed therapy (MDT) is a new approach for localized treatment, and many clinical trials are ongoing. In the present case, biochemical recurrence occurred 8 months after a radical prostatectomy for localized prostate cancer, and oligometastases were diagnosed via whole-body magnetic resonance imaging. Metastasis-directed radiotherapy (MDRT) was performed on all oligometastatic sites. After MDRT without androgen deprivation therapy, the prostate-specific antigen (PSA) decreased to an undetectable level and did not increase for 24 months.