N1a TNM Finding

**Semantic type:** Finding

**Definition:** A general term that refers to a TNM finding of cancer metastases usually in a limited number of regional lymph nodes. The definition of N1a TNM finding depends on the specific type of cancer that it refers to; for example, for breast cancer it refers to metastasis in 1 to 3 axillary lymph nodes (at least 1 tumor deposit greater than 2.0 mm); for cutaneous melanoma it refers to micrometastasis in one regional lymph node; for colorectal cancer it refers to metastasis in one regional lymph node.

**Synonyms:** - N1a - N1a - N1a Lymph Node Finding - N1a Node Finding - N1a Regional Lymph Nodes Finding - N1a Stage Finding