Superficial angiomyxoma (SA) is a rare benign soft-tissue tumor, arising sporadically or as the earliest manifestation of Carney's complex. When it arises sporadically, the breast is infrequently involved with only few cases reported in the literature. Key imaging findings include T2 signal hyperintensity on MRI and hypervascularity. In this study, we report the clinical, radiological, surgical, and histopathologic findings of a case of sporadic SA of the breast in a 16-year-old girl.