From lung to breast: a rare case of metastatic lung adenocarcinoma presenting as a breast lump in a male patient.

Summary: Lung cancer usually spreads to places like the brain, liver, or bones, but almost never to the breast. This is the story of a 56-year-old man who found a lump in his breast. Even though he did not smoke, tests showed the lump was actually lung cancer that had spread. This very rare case teaches doctors that a breast lump in a man can sometimes be a sign of cancer hiding in another part of the body.