<prompt> Fibroadenoma of the breast are-Fixed massDiffuse massMultiple duffuse massSolitary mobile mass  <response>: MC benign tumor of female breast MC age group: 1530 years Known as breast mouse Etiology: Increased sensitivity of focal areas of breast tissue to estrogenPathology Encapsulated spherical lesion, composed of fibrous and glandular tissue Arise from interlobular stroma, stromal cells can be monoclonal or polyclonalTypes Pericanalicular Hard: Due to proliferation of connective tissue inside the elastic lamina Intracanalicular Soft: Due to proliferation of connective tissue outside the elastic laminaClinical Features Painless, slowly growing solitary mobile lump in the breast Breast mouse Diagnosis Characteristic popcorn calcification on mammography IOC is FNACTreatment No treatment is necessary when diagnosis is confirmed. Excision biopsy is the treatment of choice for suspicious lesion and for cosmetic indications. 