To characterize mammographic and ultrasonographic (US) features of uncommon breast masses, to compare the radiologic and histopathologic findings.

Uncommon lesions of the breast can present a diagnostic challenge.

Case 1 25 years old women with a palpable left breast mass, presented as focal acoustic shadowing without a mass configuration on ultrasound. Mammography was negative because of dense breast tissue. The patient was diagnosed as sclerosing adenosis by core needle biopsy under ultrasound (Fig1). Sclerosing adenosis is a benign proliferative disease of the breast. On clinical, radiological, and even histopathological examination, it can be confused with malignancy. On histopathological examination, sclerosing adenosis is present in 12% of benign and 5%–7% of malignant specimens (1)....

Mammographic and ultrasonographic features of uncommon breast masses are presented andthe radiologic and histopathologic findings are compared. Radiologists should be familiar with the characteristic mammographic and ultrasonographic appearances of these lesions and should considerin the differential diagnosis.

Prof Dr C. Zuhal Sunar ERDEM, Bulent Ecevit University Hospital, Department of Radiology, Zonguldak, TURKEY, e-mail address: [email protected]

1.Taşkin F, Köseoğlu K, Unsal A, Erkuş M, Ozbaş S, Karaman C. Sclerosing adenosis of the breast: radiologic appearance and efficiency of core needle biopsy. Diagn Interv Radiol. 2011 Dec;17(4):311-6. doi: 10.4261/1305-3825.DIR.3785-10.2. Epub 2011 Feb 15. 2. Tavassoli FA. Pathology of the breast. Norwalk: Appleton and Lange, 1992; 93–97. 3. Nielsen NS, Nielsen BB. Mammographic features of sclerosing adenosis presenting as a tumour. Clin Radiol 1986; 37:371–373. 4. Rasbridge SA, Millis RR. Carcinoma in situ involving sclerosing adenosis: a mimic ofinvasive breast carcinoma. Histopathology 1995;...