Ultrasonographic Findings of Metaplastic Squamous Breast Carcinoma and the Pathologic Correlation

ma that comprises less than 5% of all breast malignancies (1, 2). These tumors are ductal carcinomas that can undergo a variety of metaplastic changes including squamous cell, spindle cell, and heterologous mesenchymal growth (3, 4). The most common of these metaplastic changes is squamous metaplasia, and its incidence varies from 0.5 to 2.0% (5). The microscopic criteria for the diagnosis of the squamous component are defined as keratinization, intercellular bridges and cystic areas (3, 4). Although there have been many reports about the radiologic findings of metaplastic breast carcinoma, to our knowledge, there have been few reports about the ultrasonographic (US) findings of metaplastic squamous breast carcinoma. Therefore, we described here the US appearance of metaplastic squamous breast J Korean Radiol Soc 2004;51:669-674