METASTATIC LUNG ADENOCARCINOMA PRESENTING AS A CONTRALATERAL BREAST LUMP: A DIAGNOSTIC CHALLENGE.

A 52-year-old Retroviral positive female presented with a painful lump in the right breast that had persisted for 2 months. She reported no pulmonary or abdominal symptoms. On physical examination, a small, well-defined, tender lump was noted in the upper outer quadrant of the right breast, which was fixed to the skin. Comprehensive investigations were conducted, including Fine Needle Aspiration Cytology (FNAC), excision biopsy, immunohistochemistry, and a PET scan. These investigations led to the diagnosis of primary lung adenocarcinoma with metastases to the breast and bone.