N1b 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 N1b TNM finding depends on the specific type of cancer that it refers to; for example, for breast cancer it refers to metastases in internal mammary lymph nodes with micrometastases or macrometastases detected by sentinel lymph node biopsy but not clinically detected; for cutaneous melanoma it refers to macrometastasis in one regional lymph node; for colorectal cancer it refers to metastasis in 2-3 regional lymph nodes.

**Synonyms:** - N1b - N1b - N1b Lymph Node Finding - N1b Node Finding - N1b Regional Lymph Nodes Finding - N1b Stage Finding