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Table 1 Anatomic borders of CTV for chest wall and regional nodes

From: Post mastectomy linac IMRT irradiation of chest wall and regional nodes: dosimetry data and acute toxicities

Structures Cranial Caudal Anterior Posterior Lateral Medial
Chest wall Caudal border of the clavicle head Contralateral inframammary fold 2 mm below the skin surface Rib-pleural interface Mid-axillary line Sternal-rib junction
Supra-clavicular Caudal to the cricoid cartilage Junction of brachioecph.- axillary veins/caudal edge clavicle head Posterior edge of SCM muscle Anterior aspect of the scalene muscle Cranial: lateral edge of SCM muscle Excludes thyroid and trachea
Caudal: junction 1st rib-clavicle
Infra-clavicular Pectoralis minor muscle insert on coracoid Axillary vessels cross medial edge of pectoralis minor muscle Posterior surface of pectoralis major muscle Ribs and intercostal muscles Medial border of pectoralis minor muscle Thoracic inlet
Internal mammary Superior aspect of the medial 1st rib. Cranial aspect of the 4th rib Encompass the internal mammary vessels Encompass the internal mammary vessels Encompass the internal mammary vessels Encompass the internal mammary vessels
  1. Abbreviations: SCM= sternocleidomastoid.