A hamartoma is a disorganised focus of a mature overgrowth of cells composed of tissue elements of the organ in which it is found, and it can occur anywhere in the body. A breast hamartoma is a rare, benign tumour consisting of fat, glandular and fibrous tissue, and is known by various names such as lipofibroadenoma or fibroadenolipoma, depending on the dominant tissue found within the lesion. The reported incidence is low (0.1% – 0.7%), but is increasingly thought to be because of under-diagnosis of the condition.
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