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Case ReportOpen Access
Muscular Hamartoma of the Breast : A Rare Breast Lesion Containing Smooth Muscle
Khunamompong S 
,
Chaiwun B ,
Wongsiriamnuay S
,
Chaiwun B ,
Wongsiriamnuay S Hamartoma of the breast is an uncommon entity, usually presenting as a well-demarcated
breast mass. Microscopically, the lesion is composed of mammary glandular component, fibrous
stroma, adipose tissue, and smooth muscle in variable proportions. Among the variants of breast
hamartoma, muscular hamartoma is rare. This lesion should be differentiated from other breast
tumors that contain smooth muscle element.
We report a breast lesion of a 36-year-old woman diagnosed as a muscular hamartoma in
which the muscular component is cellular and some mitotic figures are present. The criteria to distinguish
between benign and malignant smooth muscle lesions in the breast, emphasizing mitotic
count, are also discussed.
breast mass. Microscopically, the lesion is composed of mammary glandular component, fibrous
stroma, adipose tissue, and smooth muscle in variable proportions. Among the variants of breast
hamartoma, muscular hamartoma is rare. This lesion should be differentiated from other breast
tumors that contain smooth muscle element.
We report a breast lesion of a 36-year-old woman diagnosed as a muscular hamartoma in
which the muscular component is cellular and some mitotic figures are present. The criteria to distinguish
between benign and malignant smooth muscle lesions in the breast, emphasizing mitotic
count, are also discussed.
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