Multimodality Imaging Findings of Metaplastic Breast Carcinomas: A Report of Five Cases

Metaplastic carcinoma is a rare subtype of breast cancer that comprises histologically diverse malignancies. Metaplastic carcinoma tends to have an aggressive clinical presentation, high metastatic potential, and more chances of local recurrence, as compared with intraductal carcinoma. Although many clinical and pathologic finding have been reported, to our knowledge, there are few reports of imaging findings for this type of tumor. In this study, we reviewed data of 5 patients with histopathologically proven metaplastic breast carcinoma. Multimodality imaging findings including those from mammography, ultrasonography, magnetic resonance imaging, and positron emission tomography–computed tomography were recorded. The results indicated that metaplastic carcinomas tend to show more benign imaging features such as round or oval shape with circumscribed margins and less axillary lymph node metastasis compared with invasive ductal carcinoma. High signal intensity on T2-weighted magnetic resonance imaging due to its cystic or necrotic component may be useful for diagnosis of metaplastic carcinoma.