The authors analyzed ultrasonographic findings of 60 cases of breast lesions which were proven surgically of pathologically at Seoul Red Cross hospital from September 1986 to February 1989. The results were af follows; 1. Threre were 30 fibrocystic diseases 12 fibroadenoms 8 carcinomas 3 absceses 3 foreign bodies 2 gynecomastias 1 intraductal papilloma 1 malignant cystosarcoma phlloides. 2. ultrasonography provided accurate information for the size location internal structure and relationship between lesion and ajacent structure. 3. Ultrasonography can be used as an ajunct to film mammography in selective patients and useful for guiding fine needle aspiration biopsies.