bloody discharge

I am 48 years old, and have had persistent non-spontaneous yellow-ish milky discharge from both nipples, multiple ducts, for many years. Substantial amounts when I squeeze even a little bit (which I didn't do very often--only with breast self-exam every month or two). Then about a month ago I noticed a dark bloody discharge coming out of one duct, left breast (still non-spontaneous, except very occasional very tiny spotting). When squeezed slightly, significant amount of dark blood comes out of same duct. Went immediately  for consult with breast surgeon, who sent me for a mammogram and ultrasound. Mammogram showed asymmetric density in left upper outer quadrant. Nothing that correlates with the discharge. Ultrasound showed multiple dilated ducts in left nipple, but no indication of why. Both tests designated as inconclusive. I was told to do a BSGI because of dense, lumpy breast tissue that is making it hard to assess. Bloody discharge persists. A few of other maybe related things--had some hormone work done about three months ago--showed low-normal prolactin levels, high (650-ish) estrodial levels, and very low progesterone levels. I am still ovulating every month. I had a lump removed from left breast about 7 years ago--benign fibroid. So, is bloody discharge that is associated with a malignancy ALWAYS spontaneous? Why so much discharge with low prolactin levels? Is the bloody discharge related in any way to the milky discharge?  I'm getting really worried. Thank you!

[Cleveland Clinic]

Dear mbm0105,  Bloody discharge can be a symptom of a number of conditions benign as well as malignant.  It is a symptom that needs evaluation (as you are doing). Discharge from the nipple is usually associated with increase prolactin levels so with low levels and discharge there may not be any correlation between that and what is occuring in your situation.  This symptom needs to be evaluated in context of your whole situation - the mammogram results as well as any other testing, your breast surgeon will be better able to discuss the causes in your situaiton as more information is evaluated.  

[mbm0105]

Thank you for a quick response.  The one question I still have is, is bloody discharge that is associated with a malignancy always spontaneous, or can non-spontaneous bloody discharge SOMETIMES be caused by a malignant condition?  I can't find a clear answer to this anwer I look.  Thank you.

[whyohwhyme]

A related discussion, bloody discharge was started.