INTRODUCTION
toxicity, prostate cancer, prostate
PROSTATE CANCER, PROSTATE
Radiation therapy (RT) for patients diagnosed with localized prostate cancer has rapidly evolved during the past decade. However, radiation induced rectal toxicity remains a concern due to the proximity between the prostate and the rectum.Both spacers are intended to temporarily position the anterior rectal wall away from the prostate during radiotherapy for prostate cancer, while sparing the anterior rectum from excessive radiation.However, there are differences in how the volume between the prostate and rectal interface is created based upon the devices themselves. The implantation procedure of the balloon spacer includes establishing a working channel along the plane from prostate apex to base using a beveled tip dilator dissection with an option for hydro dissection. The balloon spacer is inflated with saline, providing about 18 mm space height,This multicenter, double‐arm, central core lab, retrospective study aims to compare the rectal dosimetry in patients implanted with either the SpaceOAR or the balloon spacer, in the context of CF, as well as UH treatment plans.