According to the AJCC 8th edition, a cervical lymph node metastatic from oral cavity squamous cell carcinoma that is FIXED to underlying structures, regardless of its size, is classified as:
- A N3b ✓
- B N3a
- C N2b
- D N1 with an extranodal extension suffix
Correct answer: A. N3b
Explanation
In the 8th edition, clinically demonstrable extranodal extension is defined as fixation of the node to underlying structures or invasion of overlying skin, and such nodes are staged N3b irrespective of size. N3a is reserved for nodes larger than 6 cm without extranodal extension. The (ENE) suffix applies to pathologically detected extranodal extension in smaller nodes, not to clinical fixation.
Reference: AJCC Cancer Staging Manual, 8th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.