We encountered a patient with a breast mass which had metastasized from gastric carcinoma representing as aninflammatory carcinoma on ultrasonography. We described the radiologic and clinical features, and review theliterature. The patient had advanced gastric carcinoma and breast ultrasonography demonstrated the presence ofvery ill-defined, infiltrating, and mixed echoic lesions indistinguishable from findings of primary inflammatorybreast carcinoma. Metastatic gastric adenocarcinoma was confirmed pathologically.