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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.