CPB Ljubljana 2018 course book

GEC-ESTRO Recommendations for APBI PTV Definition After Open Cavity Surgery

1. Cavity visualization score ≥3 to minimize the interobserver variations. 2. Delineate only the homogeneous part of the postoperative seroma ; exclude protrusions or sharp irregularities. 3. Surgical clips have to be surrounded by the contour with close contact (no margin) 4. CTV is created from the outlined surgical cavity with a safety margin taking into account the size of the free resection margin. 5. The total size of safety margin is always 20 mm which is the sum of the surgical and added safety margins. 6. CTV is limited to chest wall/pectoral muscles and 5 mm below the skin surface.