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Adenomyoepithelioma of the breast is a rare tumor. A myoepithelial carcinoma arising within an adenomyoepithelioma is even more unusual. There are a limited number of reports discussing myoepithelial carcinoma; most of them describe pathological findings, but not imaging findings. We present a case of a 55-year-old woman who had a screen-detected myoepithelial carcinoma arising within an adenomyoepithelioma in her right breast. Upon the completion of a mammography and sonography an oval shaped mass with an indistinct margin in the upper portion of the right breast had been seen. It as appeared to be a spiculated, irregular-shaped, peripheral-enhancing mass on an MRI. On sonography-guided biopsy, an epithelial-myothelial tumor was confirmed, and the possibility of myoepithelial carcinoma was suggested. Breast-conserving surgery with a sentinel lymph node dissection was performed, and a pathological examination revealed a myoepithelial carcinoma arising within an adenomyoepithelioma.

Background: Invasive cribriform carcinoma (ICC) of the breast is a distinct histologic type of invasive carcinoma that is known to have a relatively favorable prognosis. There is very little information about ICC radiologic findings. Objectives: The purpose of this study is to investigate ICC radiological findings, including those of mammography, sonography, and magnetic resonance imaging (MRI), and histopathological findings. Patients and Methods: Mammography, sonography, and MRI findings of twelve female patients with ICC in our institution were retrospectively reviewed by two radiologists in consensus. Diagnoses were based on surgically resected specimens, and image features were reviewed according to the American college of radiology breast imaging reporting and data system (ACR BI-RADS®) lexicon. Histopathological findings were reviewed by two experienced breast pathologists in consensus. Results: Of the twelve patients, eleven underwent pre-operative mammography, and all underwent pre-operative sonography and MRI. Mammographic findings were mass (n = 8), focal asymmetry (n = 2), or no detectable finding (n = 1). Most masses had irregular shapes, indistinct margins, equal densities to the parenchyma, and no associated calcification. By sonography, all masses were hypoechoic with variable shapes. The margins of the tumors were mostly indistinct. Each tumor was depicted as an enhancing mass with an irregular, oval, or round shape on MRI. Usually, the margins were irregular, and enhancement patterns were type III. On histopathologic examinations, most tumors were grade I, and all were luminal subtype A by immunohistochemical study. Conclusion: ICCs of the breast appear as masses with typical features of malignancy using radiologic techniques. The differences in the radiologic features of invasive ductal carcinoma of no special type, which is the most common invasive breast malignancy, and ICCs are that ICCs usually appear without associated calcifications and show rare spiculation. [ABSTRACT FROM AUTHOR]

Metastatic involvement of the breast from an extra-mammary tumor is rare. However, when a patient with a known primary malignancy complains of a palpable breast mass, both the primary breast cancer and the metastatic lesion must be considered as a differential diagnosis. Melanoma is one of the tumors that commonly metastasizes to the breast, but the characteristic imaging features are not well known. Therefore, an understanding of the characteristic image findings for melanoma would be advantageous in differentiating a breast mass in patients with a history of melanoma. A 73-year-old woman with a history of recurring melanoma in the nasal cavity presented with a palpable mass in the left breast. She had undergone various imaging studies, which revealed two masses in the left breast and an enlarged right intramammary lymph node. The patient underwent lumpectomy of masses in the left breast for tissue confirmation, and pathologic examination revealed metastatic melanoma. Melanoma exhibits typical signal intensity on MRI and commonly metastasizes to the breast. Therefore, it is important tobe aware of the characteristic imaging findings for metastatic melanoma, particularly when a melanoma patient presents with a breast lump. [ABSTRACT FROM AUTHOR]