Breast cysts: These are formed by the accumulation of milk, which can be differentiated by ultrasound and mammography. Lobulated adenofibroma: Both lipomas and lobulated adenofibromas are lobulated, with the latter being harder and more distinctly lobulated than the lipomas. Mammary adenoma: Both mammary lipoma and mammary adenoma have clinical masses, but the texture is different, with lipoma being slightly harder. Ultrasonography and mammogram can differentiate them. Breast lipoma is a rare benign tumor of the breast, which is easy to be misdiagnosed clinically. The diagnosis mainly relies on medical history, physical examination and needle aspiration cytology examination. 2.Clinical characteristics: Mostly seen in middle-aged women, mostly in those with plump and obese breasts; mostly found unintentionally. Mostly single lump, superficial, soft texture, clear border, smooth surface, good mobility, no pressure pain, no adhesion with surrounding tissues, lobulated feeling at the base, size not related to menstrual cycle, no abnormalities in bilateral axillary lymph nodes. 3.Molybdenum X-ray examination: round-like low-density shadows are seen in the breast, with uniform density, clear borders and thin walls, and the breast glands are pushed to one quadrant, and the rest have no special findings. 4.Needle aspiration examination: For those who have difficulty in diagnosis, needle aspiration cytology examination can help to confirm the diagnosis. 5.Surgical treatment: The treatment of breast lipoma is mainly surgical. Curved incision is made, skin and subcutaneous tissue are cut, the mass is separated and the tumor is removed completely. 6.Pathological examination: The tumor tissue consists of differentiated mature fat cells, diffusely distributed, without lobular structure, with intact envelope.