Delayed healing after pelvic surgery. Twenty-one-year-old patient with advanced and refractory Hodgkin lymphoma after several lines of CT and previous thoracic RT. A few days after commencement of pelvic RT, the treatment was discontinued because patient required surgery for appendicitis. (Left) Before O3T: wound delay 12 days after surgery and standard management (13.5 cc volume: 60x15 mm by 15 mm deep). We decided to apply local O3T and restart RT. (Right) After 5 O3T sessions during 3rd week of RT. Wound closed completely after 8 O3T sessions in 24 days during RT.