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QUICK GUIDE
Breast or chest wall:
CRANIAL:
Clinical reference, maximally up to inferior edge sterno-clavicular joint
CAUDAL:
Breast end (chest wall: guided by contralateral breast)
ANT:
5 mm skin (if possible) or skin (RTOG)
POST:
Pectoral M
LAT:
Clinical reference, anterior to the lateral thoracic artery
MEDIAL:
Sternal-rib junction; perforating mammary vessels