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| Fibrocystic breast changes [Go Back to Keywords List Page]  | Fibrocystic breast changes Fibrocystic breast changes are the most common cause of
breast lumps. Fibrocystic breast lumps are cysts; that is,
fluid-filled sacs surrounded by fibrous tissue. These cysts
are not caused by cancer. Fibroadenomas, another common
cause of breast lumps, are solid lumps of fibrous tissue.
They also are not caused by cancer.
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