© Turkish Society of Radiology 2010

A lthough classical textbooks state that hamartomas are rare tumors, radiologists who use both mammography and ultrasonography (US) frequently encounter hamartomas in their daily practices. These tumors present as painless and mobile masses with well-defined borders. They are composed of variable amounts of glandular tissue, fat and fibrous elements that produce a mass of disorganized but mature specialized cells or tissues (1–3). The complete resemblance of the tis-sues to normal breast parenchyma and an occasional admixture of other elements limit the contribution of the pathological examination to the diagnosis. The correlation between clinical and radiological findings is of paramount importance (4, 5). Although mammographic and US find-ings of breast hamartomas have been well defined, advanced magnetic resonance imaging (MRI) findings in such cases have not been previ-ously described. This study provides a description of dynamic contrast-enhanced MRI (DCE-MRI), diffusion-weighted imaging (DWI) and MR spectroscopy (MRS) findings in breast hamartomas. Materials and method