Incidentally detected carcinoma in situ in a fibroadenoma of breast in a postmenopausal woman: A case report

Fibroadenomas are the most common benign tumor of the breast. It can occur in women of any age, but the peak incidence seen in young adolescent women during the second and third decades of life. Fibroadenoma is a biphasic tumor, composed of an epithelial and a stromal component. Even though they are solitary lesions, multiple fibroadenomas can also occur especially in the older age group. Breast fibroadenomas seemed to display a wide spectrum of proliferative and non-proliferative histologic changes. Of all these changes, carcinoma arising from fibroadenoma is a rare occurrence. Here, we have presented such a rare case of carcinoma in situ arising from the long standing multiple fibroadenoma in a postmenopausal women. Clinical and radiological features are not helpful in identifying carcinoma arising from fibroadenoma. Histopathological examination of the excised specimen should be done for the confirmation of the diagnosis.