<prompt> Which of the following condition does not contain fat on mammography?HamaomaGalactocelePost-traumatic cystSeborrheic keratosis  <response>: Seborrheic keratosis are the most common skin lesion that is visible on the mammogram. These are benign skin lesions that are associated with aging. They appear wa like with a verrucoid surface, with air trapped in the irregular cracks in the surface of the lesion. Ref: Breast Imaging By Daniel B Kopans, Pages 481-482; Radiology Review Manual By Wolfgang Dahne, 7th Edition, Page 555 