Breast lumps may be due to cysts. Cysts are fluid filled nodules that occur in women with fibrocystic disease. Fibrocystic disease is a benign (meaning non cancerous) condition that occurs in the breast. Some women may develop large cysts that may be painful, these can be drained by the radiologist with a simple procedure to provide relief to the patient. Cysts may make breast self exam and your doctor’s clinical breast examination more difficult. Your doctor may order a mammogram to see if any suspicious masses are hiding behind the cysts as cancerous lumps may develop anywhere in the breast including in cystic areas and be difficult to detect.The cysts make the breast tissue denser and more difficult to interpret on mammography. Breast ultrasound is an additional test, frequently done when a lump is felt, which can easily identify cysts.