Breast cysts are benign fluid-filled sacs that grow inside the breast tissue, normally affecting women over the age of 35 who have not reached the menopause.
They are also detected in women who are using hormone replacement therapy (HRT) after they have went through menopause.  

Cysts in both your breasts, is quite common, and they can become larger, tender and become painful just before your menstrual period.
Cysts can occur without noticing anything symtoms, and they are sometimes found by chance when examinations by your GYN are done for some other reason.
Usually, all breast cysts identified as “simple cysts” It is estimated that perhaps 1 in 1,000 cysts may harbor a tumor (not necessarily malignant). These can usually be identified by using an ultrasound. Women with cysts are not at greater risk for the development of Cancer although this risk may be high if there is a family history for breast Cancer.

Diagnosis

Breast cysts can be detected by getting examined by your doctor usung the curreb=nt tests listed below:
• Breast examination
• Mammogram
• Ultrasound scan
• fine needle aspiration cytology (FNAC).- The FNAC involves drawing off fluid from the cyst with a fine needle. If the lump is difficult to find within the breast you may have an ultrasound scan.

Treatment

If the cyst is large or does not go away on its own, your specialist will probably draw off the fluid with a fine needle and syringe.
Once the fluid has been removed the cyst usually disappears. The drawn off fluid will only be sent to the laboratory for testing if it is bloodstained, as there is a small risk that this may be a sign of breast Cancer.
Cysts can come back.  This usually happens in about 30% of breast cyst cases. The treatment will be the same each time the breast cyst occurs. If a breast cyst continues to refill with fluid, a doctor may suggest a surgical biopsy to remove it.