Mondor's disease or thrombophlebitis of the superficial veins of the breast is a rare benign condition and a self-limiting disease. The combination of the clinical manifestations and the imaging (mammographic & sonographic) findings is the typical sign of Mondor's disease of the breast. Therefore, an understanding of such an entity and knowledge of the clinical and imaging findings will make it possible to avoid the unnecessary biopsy or surgery. We report the case of a 53-year-old woman diagnosing as Mondor's diasease, who underwent evaluation of a tender, papable cord- like mass in her left breast associated with discoloration of the overlying skin.