Case report of the first use of a hydrogel rectal spacer for prostate cancer reirradiation via LDR brachytherapy: applications and technical notes - Lazrek, Amina; Finocchi Ghersi, Sebastiano; Petre, Adeline; Houabes, Sarah; Serre, Anne-Agathe; Gassa, Frederic; Sandt, Magali; Laude, Cecile; Roukoz, Camille; Cozzi, Salvatore (Frontiers in Oncology, 2025)