A rare case of benign mesenchymoma of the breast in a man.

The term 'benign mesenchymoma' was first used by Stout in 1948 and has since been widely adopted to describe benign tumours made up of a mixture of mesenchymal tissues which had previously been called by many names, such as hamartoma and angiolipoma. This tumour is most commonly found in the renal and perirenal tissue. Benign mesenchymomas arising in the breast are extremely rare. We present, to our knowledge, the first reported case of benign mesenchymoma in a male breast. The clinical presentation, course and treatment of the patient are discussed.