For the simulation workshop, a silicone breast model consisting of a soft inner core and an outer skin was used. Therefore, silicone basis component and catalyzation component (SF00-RTV2 Silicone [silicone rubber], SILIKONFABRIK.DE) were mixed in a ratio of 1:1, then silicone oil (SF-V50, SILIKONFABRIK.DE) and Alginat (Protesil ®, ISO 21563) were added. Finally, a color paste (European‑3, FPHE3; Silikonfabrik.de, Ahrensburg, Deutschland) was used to give the model an authentic skin-colored tone. To ensure the soft texture of the inner core, salt and semolina were added to the mixture. The prepared inner core mixture was cast in a ceramic mold with a wire-fixed Styrodur® sphere of approximately 2 cm in diameter, which was supposed to simulate the tumor bed (Fig. 1). After the silicone had cured, the inner core was transferred to a breast-shaped plaster mold treated with silicone removal agent by keeping a gap of 1.5 cm between the inner core and mold, which was filled with the silicone mixture for the outer skin. After a second curing period, the whole breast could be gently removed from the mold.

Photographic images (a) and CT scans of the breast model in axial (b) and sagittal view (c). The imitation of the tumor bed appears hypointense on CT. The catheter positions (d) within the breast model are visualized by CT scan (e, f)

The breast model was evaluated by experienced radiation oncologists (MM, SD, SK) for its condition, safety, and suitability for training purposes prior to use.
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