Purpose: The purpose of this study was to examine ultrasound elastographic images of ductal carcinoma in situ (DCIS). Subjects and Methods: Forty-six cases of DCIS were encountered from April 2007 to March 2008. The elasticity of the hypoechoic area was divided into five grades by ultrasound elastography. We reviewed the elasticity scores of subjects obtained by elastography (score of 1 to 5). The elasticity scores were compared with B-mode imaging (mass image-forming lesions and non-mass image-forming lesions), color Doppler imaging, pathological finding (comedo and non-comedo type), and calcifications (category 3, 4, or 5 according to the mammography guideline) on MMG. Vascularity on color Doppler imaging was visually classified into four grades: avascular, hypovascular, vascular, and hypervascular. Results and Discussion: The elasticity scores were as follows. There were five lesions with a score of 1, eight lesions with a score of 2, 18 lesions with a score of 3, 12 lesions with a score of 4, and three lesions with a score of 5. When a cutoff point between score 3 and 4 was used, the sensitivity was lower (32.6%) when compared with the sensitivity in the literature. Twenty-two lesions were mass image-forming and 24 lesions were non-mass image-forming. The scores of non-mass image-forming lesions were statistically lower than those of mass image-forming lesions. There was no significant relationship between comedo/non-comedo type and the elasticity score. There was also no relation with calcifications on MMG. Vascularity did not affect the score in any of the cases. Conclusion: There are more cases with lower elasticity scores in DCIS, especially in cases with non-mass image-forming lesions.