Figure 1.

Examples of delineation shown in the guide and simplified rules of delineation.

Supraclavicular region: contouring of the supraclavicular region is guided by the origin of the internal mammary artery.

Cranial: Thyroid cartilage

Caudal: Clavicular head

Medial (med): Trachea

Posterior (post)-lateral (lat): Anterior scalene muscle

Post-med: Carotid artery

Infra clavicular region: The infraclavicular region corresponds to the lymphatic drainage between axillary vertex, and the superior limit of the axillary LN dissection (LND).

Cranial: Pectoralis minor

Caudal: Sternoclavicular joint

Lat: Pectoralis minor (medial side)

Med: Clavicle

Ant: Pectoralis major

Post: Axillary artery

Internal mammary chain: The lymph nodes of the IMC are located within the anterior interspaces; they are located either medial or lateral to the vessels and are concentrated in the upper three interspaces.

Ant: Ant. part of the vascular area

Post: The pleura

Med: Medial limit of the vascular area

Lat: Lateral limit of the vascular area

Caudal: Superior side of the fourth rib

Cranial: Inferior limit of supraclavicular area

Rotter LN or intra pectoral node: situated between: pectoralis major and pectoralis minor at the second intercostal space

Axilla:

Ant: Pectoralis major and pectoralis minor

Post: Subscapularis, teres major and latissimus dorsi

Med: Seratus anteriorLat: 5 mm backward the skin

Caudal: fourth and fifth ribs

Cranial: Inferior limit of infraclavicular volume or “first clip”