Having all of you as resources is nothing less than great!
I have a mom who was a client in Sept. '93.  When I was called in
it was because baby wouldn't latch on to left side.  Ride side
latch was fine.  As I worked with mom and baby, mom told me that
her left nipple had changed early on in her pregnancy (I saw a
somewhat dimpled appearance with a hard band of tissue under the
breast skin surface from about 12 o'clock to 6 o'clock) and her OB
had told her it was a plugged milk duct.  The appearance and skin
texture worried me a lot and I suggested rather strongly that she
get the whole thing checked out thoroughly by someone knowledgable
about breasts.  She did and was diagnosed with breast cancer.  She
is still here, although she says her long term prognosis is poor
because she had 17 lymph nodes involved also.  As a result she is
suing her OB--she says another woman was diagnosed 2 mos. after
was by the same OB and is already dead--she doesn't think the
practice really learned anything from either of them.
Anyway---do any of you know of any research that would back the
OB diagnosis of a plugged milk duct in the first trimester of
pregnancy?  My client says she asked her OB several times about
the breast and was always told not to worry, that it would
resolve with lactation.  If something had been done early in the
pregnancy the cancer would not have spread so much.  Of course
she probably wouldn't have her daughter either.  The frosting on
the cake was that the daughter was diagnosed with cancer at 7
months--a rare kind, tumor behind the eye, no other details--
and so the stresses of the last 2+ years for the mom have been
phenomenal.  Daughter's prognosis is good.
Sorry so long.  Any references to help or hinder would be very
much appreciated.
Pat Bucknell, IBCLC
Avon Lake, OH (where the sun is shining after we've dug out from
  the blizzard of Tues. nite)