Abstract: ［Abstract］ ObjectiveTo investigate the ultrasound characteristics between the typical and atypical breast cancer and improve the understanding for the atypical breast cancer， and to reduce the misdiagnosis rate and missed diagnosis rate. MethodsRetrospective analysis of 58 cases of breast cancer patients confirmed by surgery or puncture pathology were performed. The differences are analyzed from twodimensional image including boundary, echo, shape and so on. ResultsThirtytwo typical and twentysix atypical breast cancers were enrolled in the study. Aatypical breast cancers included 13 cases of glandular structure disorder(500%), 5 cases of microcalcification type(192%), 5 cases of small nodules or cysts type(192%), 2 cases of cystic and solid type(77%), 1 case of occult type(38%). For the typical breast cancer, there was statistically significant difference between the ultrasound compared with Xray mammography and MRI（χ2=7.199，P<005）, but no statistically significant difference in the atypical breast cancer （χ2=2791，P＞005）. ConclusionMore and more atypical breast cancers were discovered. Different imaging examination have its virtues and faults. We should combined all the imaging examinations to achieve early detection, early diagnosis .

Key words: breast neoplasms, ultrasonography, diagnosis