Images of a Mammary Lesion (IMAGE) Purdue University Caption These two images are examples of a mammary lesion in tissue surrounding a tumor from a dog (left) and one in human mammary tissue (right). Purdue research shows that the similarity between canine and human lesions associated with breast cancer makes dogs an ideal model to study progression of the disease while it is still treatable. Credit Sulma Mohammed Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.