Objective To evaluate the role of

1 H spetral selected point-resolved spectroscopy （SS-PRESS） sequence in distinguishing benign from malignant breast lesions by the malignancy marker of choline peak and to investigate the factors influencing the diagnosis. Methods A total of 131 patients （aged 24-83 years

average 44.8 years） were enrolled in this study. The examinations were performed on a 1.5T scanner with four-channel phased array breast coil. Single-voxel proton magnetic resonance spectroscopy （

1 H MRS） was acquired by SS-PRESS sequence in these patients referred to surgical or biopsy consultation. Results Among these patients

74 were proved to have breast carcinomas and 57 have benign lesions by histopathological examinations. Thirty-one elevated choline peaks were observed in these 74 confirmed malignant lesions

and 5 detectable choline peaks were demonstrated in the 57 benign lesions. The sensitivity and specificity of

1 H SS-PRESS MRS were 41.9% and91.2%

respectively. The main factors influencing the diagnosis were signal-to-noise ratio and pathological type. Conclusions

1 H SS-PRESS MRS can provide a noninvasive

biochemical measurement of metabolism and improve the specificity of breast magnetic resonance imaging. Choline peak in vivo is a specific but not sensitive marker of malignancy. Technique factors and histopathological characterization of lesions influence the detection rate.