Sentinel Lymph Node

**Semantic type:** Body Part, Organ, or Organ Component

**Definition:** The first lymph node that is affected by cancer spread from the primary site. Sentinel lymph node biopsy is part of the staging work-up to determine early metastasis to regional lymph nodes in patients with breast carcinoma or melanoma.

**Synonyms:** - SLN - Sentinel Node - sentinel lymph node