Breast cysts - Symptoms and causes - Mayo Clinic - Breast cancer benign cysts
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Breast cysts are a benign (not cancer) condition. They're one of the most common causes of a breast lump, and can develop in either one or both breasts. A firm, round lump in breast tissue could be a fluid-filled cyst. Breast cysts are fluid-filled sacs inside the breast, which are usually not cancerous (benign). Having breast cysts doesn't increase your risk of breast cancer.