Aspirating a cyst
When a cyst is suspected, some doctors proceed directly with aspiration. This procedure, which uses a very thin needle and a syringe, takes only a few minutes and can be done in the doctor's office. The procedure is not usually painful, since most of the nerves in the breast are in the skin.
Holding the lump steady, the doctor inserts the needle and attempts to draw out any fluid. If the lump is indeed a cyst, removing the fluid will cause the cyst to collapse and the lump to disappear. Unless the cyst reappears in the next week or two, no other treatment is needed. If the cyst reappears at a later date, it can simply be drained again.
If the lump turns out to be solid, it may be possible to use the needle to suck out some clumps of cells, which can then be sent to a laboratory for further testing. (Cysts are so rarely associated with cancer that the fluid removed from a cyst is not usually tested unless it is bloody or the woman is older than 55 years of age.)