Katarina Kvarnhult Dec 11, 2015:

Hi Helen, Thank you for your message. The reply is now inserted. Thanks. Best regards.

Helen Johnson (asker) Dec 9, 2015:

Katarina, please could you put your suggestion as an answer or else I can't award you points (I agree with you). Thanks in advance.

Katarina Kvarnhult Dec 9, 2015:

Hi Helen, I think "bifurcated diagonal branch" should work. Have a look at "bifurcation" in the medical part of "The free dictionary" online for the definition of bifurcation.

Ann Kapborg Dec 8, 2015:

Perhaps this can help https://sv.wikipedia.org/wiki/Skänkel_(kardiologi)

Helen Johnson (asker) Dec 8, 2015:

Unfortunately it doesn't go into detail in that regard Liz, although it does mention a circumflex with a large OM branch

liz askew Dec 8, 2015:

From my poor understanding, does this involve the 2nd diagonal branch, if so it could be "occluded"

liz askew Dec 8, 2015:

The only thing I found remotely connected was "block/blockage"....