<prompt> Most common benign breast tumour:FibroadenomaFibroadenosisDCISPhyllodes tumour  <response>: Fibroadenoma is the most common benign breast tumor which is most commonly seen in young females. Fibroadenoma is also known as Breast Mouse due to its characteristic high mobility. On the other hand, fibro adenosis is a benign breast diseaseso it is excluded On Mammography if performed on older female there is popcorn calcification. The name DCISDuctal carcinoma in-situ suggests its malignancy and hence can be excluded. Phylloides tumor or Cystosarcoma Phylloides is a malignant tumor. 