Apocrine adenoma is a rare benign epithelial tumour of the breast that can
radiologically present as a well-defined opacity. The clinical, radiologica
l and pathological findings of apocrine adenoma of the breast in a 72-year-
old woman are described. Histologically, the tumour is characterised by a c
ircumscribed proliferation of metaplastic apocrine cells which may contain
calcifications. Pathological assessment of the lesion is essential in makin
g the diagnosis.