Figure 2:

(a) T1-weighted contrast-enhanced axial magnetic resonance imaging image demonstrates local glioblastoma recurrence prior to resection followed by intraoperative balloon electronic brachytherapy (IBEB). (b) IBEB isodose distribution based on computed tomography (CT) scans covers tumor bed sparing surrounding brain tissue. (c) External beam radiotherapy plan in comparison to IBEB. Isodose distribution based on the same CT scans affects extensively surrounding brain tissue which was irradiated after first surgery. (d) An overview of the post-resection cavity. (e) Intraoperative ultrasound demonstrates configuration of the postresection cavity which is free of macroscopic disease. (f) Deflated applicator balloon being introduced into the post-resection cavity. (g) Final position of the inflated applicator balloon with its dense adherence to the walls of the post-resection cavity. (h) Proper position of the balloon confirmed by intraoperative ultrasound.