An example of localized amyloid deposition in the breast of an elderly woman is reported. Fine needle aspiration biopsy yielded clumps of amorphous material, which stained violet with the May-Grünwald-Giemsa technique. The amyloid appeared to be of the AA type on histochemical analysis. The lesion was clinically associated, probably coincidentally, with a stage II carcinoma of the cervix. The nature and classification of amyloid is briefly reviewed, and the role of fine needle aspiration cytology in its diagnosis is discussed.