This CBIS-DDSM (Curated Breast Imaging Subset of DDSM) is an updated and standardized version of the  Digital Database for Screening Mammography (DDSM) .  The DDSM is a database of 2,620 scanned film mammography studies. It contains normal, benign, and malignant cases with verified pathology information. The scale of the database along with ground truth validation makes the DDSM a useful tool in the development and testing of decision support systems. The CBIS-DDSM collection includes a subset of the DDSM data selected and curated by a trained mammographer.  The images have been decompressed and converted to DICOM format.  Updated ROI segmentation and bounding boxes, and pathologic diagnosis for training data are also included.  A manuscript describing how to use this dataset in detail is available at https://www.nature.com/articles/sdata2017177.