A patient's history records an adenocarcinoma with a primary neoplasm in the oesophagus, now identified at a second distant site. What stage does this represent?

Correct answer: A. Stage IV

• A. CORRECT. Once a carcinoma has spread to a DISTANT site, it is M1 disease and therefore STAGE IV by definition. In this scenario the oesophagus is named as the PRIMARY, so any lesion found elsewhere represents metastatic spread. No combination of small primary size or limited nodal involvement can reduce the stage below IV once distant metastasis is established.
• B. STAGE III typically indicates extensive regional lymph node involvement or local invasion, but again without distant metastasis.
• C. STAGE II generally indicates a larger primary or limited local extension, still without distant spread.
• D. STAGE I is a small primary tumour confined to its site of origin with no nodal or distant spread.

Note: Oral relevance: metastases TO the jaws are uncommon but real, and the POSTERIOR MANDIBLE is the favoured site. The classic primaries that metastasise to the jaws are BREAST, LUNG, THYROID, PROSTATE and KIDNEY. Suspect metastatic disease when you see an ill-defined, moth-eaten radiolucency with numb lip (mental nerve anaesthesia — 'numb chin syndrome') in an adult with a cancer history.