Lymph Node Dissection — Surgical Removal of Nodes

Lymph node dissection involves the careful surgical excision of a regional group of lymph nodes located near a primary tumour. Surgeons typically access these nodal basins—such as those situated in the axilla, groin, pelvis, or neck—through an open incision or minimally invasive surgical techniques. The procedure may be regional, removing adjacent nodes, or radical, clearing deeper tissue.

Once removed, these tissues are examined under a microscope by a pathologist. This assessment determines whether micro-metastases or macrometastases are present. Distinguishing between positive and negative nodes establishes the pathological nodal stage (pN stage), which provides an anatomical roadmap of tumour spread and guides systemic and local therapy planning.

Pathological evaluation of excised lymph nodes is one of the most reliable methods for defining cancer stage and prognosis. The presence or absence of malignant cells directly influences multidisciplinary management decisions. When nodes are completely clear, patients may safely avoid intensive supplementary interventions. Conversely, if cancer is detected within multiple nodes or has broken through the nodal capsule (extranodal extension), teams promptly recommend systemic therapies such as chemotherapy, immunotherapy, or targeted radiation therapy to diminish recurrence risks.

Before surgery, imaging modalities including ultrasound, computed tomography (CT), and positron emission tomography (PET) assess regional node morphology. Often, a sentinel lymph node biopsy is performed first; if tumour cells are identified during rapid frozen section or permanent pathology, a completion dissection may follow. Pathologists evaluate the excised specimens using routine haematoxylin and eosin (H&E) staining and immunohistochemistry (IHC) markers to detect occult microscopic deposits.

Lymph node dissection is routinely utilised across numerous solid tumours. It is a cornerstone of surgical management in breast cancer (axillary dissection) and cutaneous melanoma. It is equally critical in gastrointestinal malignancies, including gastric and colorectal carcinomas, where examining a minimum number of nodes ensures accurate staging. The procedure is also standard in gynaecological cancers such as ovarian and endometrial malignancies, urological tumours including prostate and bladder cancer, and various head and neck squamous cell carcinomas.

The findings from a lymph node dissection directly modify downstream clinical care. A positive nodal status frequently triggers adjuvant chemotherapy, targeted molecular agents, or regional radiotherapy aimed at sterilising remaining lymphatic channels. Conversely, clear margins and negative nodes can spare an individual unnecessary treatment-related toxicities. Post-operative care also prioritises physical rehabilitation and compression garments to reduce the risk of secondary lymphoedema.