[INTRODUCTION - Recently the ultrasound examination of the strain of circumscribed breast diseases has been introduced in the non-invasive breast examination, called sonoelastography. In Hungary, the authors had the first possibility to start with this method. They report on their initial experiences. MATERIAL AND METHODS - 61 circumscribed breast lesions in 41 patients sonoelastographic examinations were performed by Hitachi EUB 6500 system using a EZUTE3 real-time elastography unit. 48 lesions strain-ratio was calculated. 22 masses were verified pathologically (18 benign and 4 malignant) and 39 were considered benign upon the findings of clinical mammography and by follow up. They classified them on the basis of patterns published by Itoh, et al. The examinations were done by three experienced radiologists. The classification was done by consensus. RESULT - The all lesions which were verified pathologically or on the basis of examinations or follow ups were thought benign showed the pattern type from 1 to 3. Most of the cystic lesions showed the streaky cystic pattern. There were small number of malignant lesions in their material, and all of them gave the elastic pattern of 4 and 5. The numbers of strain-ratio of zone lesions with pattern 3 overlapping with the lesions of malignant ones. CONCLUSION - The first results showed that both the coloured elastographic pattern and the quantitative strainratio could be used well in the non-invasive diagnostic procedure of breast lesions. It could increase the diagnostic safety. Larger number of examinations are necessitated to find the exact diagnostic role of this method.]