You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Fibroadenoma of the breast are- and explain in detail?
• MC benign tumor of female breast
• MC age group: 15–30 years
• Known as breast mouse
• Etiology: Increased sensitivity of focal areas of breast tissue to estrogen
Pathology
• Encapsulated spherical lesion, composed of fibrous and glandular tissue
• Arise from interlobular stroma, stromal cells can be monoclonal or polyclonal
Types
• Pericanalicular (Hard): Due to proliferation of connective tissue inside the elastic lamina
• Intracanalicular (Soft): Due to proliferation of connective tissue outside the elastic lamina
Clinical Features
• Painless, slowly growing solitary mobile lump in the breast (Breast mouse) 
Diagnosis
• Characteristic popcorn calcification on mammography
• IOC is FNAC
Treatment
• No treatment is necessary when diagnosis is confirmed.
• Excision biopsy is the treatment of choice for suspicious lesion and for cosmetic indications.