Benign Breast Cysts A cyst is a fluid-filled sac. Breast cysts
usually do not contain cancer cells (are benign). Some women who
have lumpy breasts also have benign breast cysts that are
surrounded by fibrous tissue. Some cysts cause lumps that can be
seen or felt (palpable). A cyst that can be felt may move about
under the fingers. Its texture depends on where it is located
and how much fluid is in it. It may feel smooth or rubbery. It
may be hard or soft. A cyst may be painful and tender or may be
painless. A cyst may get smaller after a menstrual period, or it
may persist and grow larger. Some cysts can only be seen on a
mammogram (breast X-ray) or with ultrasound. The exact cause of
breast cysts is unknown. They may be linked to the hormones of
the menstrual cycle. Breast cysts are rare in women older than
50. eMedicineHealth Medical Reference from Healthwise To learn
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