How is a painless, solitary, hard mass in the breast diagnosed?

A painless, solitary hard lump in the breast is the clinical characteristic of fibroadenoma of the breast. Breast fibroadenoma is the most common benign breast tumor, which occurs mostly in young women. The lumps are mostly round, with smooth surface, clear demarcation with surrounding tissues and no adhesions. Breast tuberculosis is common in middle-aged women, with few systemic symptoms of tuberculosis, mainly manifested as breast lumps, with a slow course. After a few months, the lump softens and forms a cold abscess. After rupture, ulceration and long-lasting overflow may occur, and thin pus like bean residue is discharged. The prevalence of breast fibroadenoma is mostly in the upper quadrant, and most of them (about 75%) are solitary, while a few are multiple. They are characterized by painless isolated lumps, which are mostly found unintentionally in the medical history; the lumps are garden or oval shaped, mostly between 1 and 5 cm in diameter, and occasionally giant fibroadenomas, which can exceed 10 cm in diameter; the menstrual cycle has no effect on the size of the tumor, and there is no abnormal nipple discharge. The growth rate is relatively slow. On examination: the lump has smooth surface, clear boundary, firm texture, no adhesion with skin and surrounding tissues, and can be pushed easily; axillary lymph nodes are not enlarged.