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Treatment that puts pellets or seeds of radioactive material into the cancerous area. The pellets (seeds) are left in place and give off low doses of radiation for weeks or months. Often used for prostate cancer, putting pellets through the skin of the perineum (behind the scrotum) into the prostate. Compare to high-dose rate brachytherapy. Also called LDR brachytherapy or permanent brachytherapy.