Unknown Primary Tumor cN3 TNM Finding v8

**Semantic type:** Finding

**Definition:** Unknown primary tumor with metastasis in a cervical lymph node larger than 6 cm in greatest dimension and ENE(-); or metastasis in any cervical node(s) with clinically overt ENE(+) (ENEc). ENEc is defined as invasion of skin, infiltration of musculature, dense tethering or fixation to adjacent structures, or cranial nerve, brachial plexus, sympathetic trunk, or phrenic nerve invasion with dysfunction. (from AJCC 8th Ed.)