Overview

Breast lymphatic drainage primarily flows to axillary lymph nodes and secondarily to internal mammary nodes influencing metastatic spread and staging. Lymphatic mapping identifies sentinel nodes for biopsy and treatment planning. Lymphatic anatomy guides surgical and radiation therapy decisions.

Axillary Nodal Levels

Axillary nodes are categorized into levels I II and III relative to the pectoralis minor and guide surgical dissection and staging. Nodal involvement impacts prognosis and adjuvant therapy selection. Imaging and sentinel node biopsy assess nodal status.

Internal Mammary and Supraclavicular Nodes

Internal mammary nodes lie along the internal thoracic vessels and supraclavicular nodes receive drainage from central pathways. Involvement of these nodes alters staging and radiation fields. Imaging and biopsy localize nodal disease for comprehensive care.

Clinical Relevance

Accurate nodal assessment is essential for breast cancer staging treatment planning and prognosis. Sentinel node biopsy imaging and PET guide management and reduce morbidity. Multidisciplinary oncology care tailors therapy to nodal status.