A rare case of a breast hamartoma containing a lesion with malignant presentation on radiologic evaluation and benign presentation on pathologic findings: A case report.

Mammary hamartomas are rare, benign, and often under-diagnosed breast lesions comprised of glandular, adipose, muscular, and fibrotic encapsulated components which occur more commonly among perimenopausal women. The term hamartoma was initially coined by Arrigoni in 1971 to describe breast lesions with clinical resemblance to fibroadenomas. The proper diagnosis of breast hamartoma is confirmed through using multiple radiologic and pathologic modalities. Hamartomas rarely progress into malignancy with only a few cases reported in the literature. Here, we report a case of a highly suspicious lesion developing within a breast hamartoma in a 46-year-old woman with radiologic features of a malignant lesion with benign pathology.