Metastatic Breast Cancer From Rhabdomyosarcoma Mimicking Normal Breast Parenchyma on Sonography

Rhabdomyosarcoma is a common childhood malignancy. In breast tissue, it is rarely primary and most often metastatic from another site.(1) To our knowledge, there have been few reports detailing sonographic findings of rhabdomyosarcoma in the breast,(2) and the reports that do exist describe various appearances. Here we report a case of metastatic rhabdomyosarcoma in the breast for which the sonographic features were not well differentiated from the normal breast parenchymal structure.