On second thought it would better to call this 'main branch of the LCx' of 'LCx main branch'

Since I think this is what is meant here:

ramus angularis van de LCX:


De LCX is verschillend van persoon tot persoon. De LCX kan bestaan uit een hoofdtak (Lat. Ramus Angularis) met één of meerdere marginale takken (Lat. Ateria Obtusa Marginalis) en de Postero-laterale eindtak(ken). De LCX bevloeit voornamelijk de achterzijde (postero-lateraal gedeelte) van het linkerventrikel.

https://libstore.ugent.be/fulltxt/RUG01/001/312/156/RUG01-00...

For the LCx see:

Overview
What is the circumflex artery?
The circumflex artery is one of two branches of your left main coronary artery. It delivers oxygenated blood to the back and side of your heart’s left pumping chambers. Your healthcare provider may refer to it as the circumflex branch of the left coronary artery, the LCx artery or simply “the circ.”

https://my.clevelandclinic.org/health/body/23926-circumflex-...

image of the LCx

https://en.wikipedia.org/wiki/Circumflex_branch_of_left_coro...


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Eample 'main branch of LCx'

Coronary angioscopy (Video 3) and OCT revealed ulcer lesion (a cavity on the vessel wall) and floating thrombus at the main branch of LCx and the protrusion of OM stent struts to the main branch of LCx (Fig. 3C, D).

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8758592/



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Image of (left) circumflex artery ([L])Cx, including main branch:

https://upload.wikimedia.org/wikipedia/commons/1/18/Coronary...

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([L])Cx --> ([L]Cx)

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Note:

'angular branch' as a translation for '[ramus] angularis' would be too general and ambiguous and may not be used in English in this context.

I cannot find it for the LCx main branch.

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Instead of 'main branch of LCx', you could also call it 'proximal circumflex artery' or 'proximal LCx' if you wish.

See SYNTAX score.
More specifically: Table 1. Segment weighing factors

https://www.researchgate.net/publication/26816591_The_SYNTAX...





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I will post a larger segment of the the above reference.
We are talking about the human heart and a Belgian text:

Epicardiale coronairen
Vertrekkend van de aorta sinus vernauwen deze coronairen van 2-4 mm naar 400 µm en vormen het begin van het coronaire netwerk. De Left Main Coronary Artery of LCA (Lat. Truncus Communis) deelt zich in de Left Anterior Descending coronary artery (LAD) en de Left CircumfleX coronary artery (LCX). De LAD heeft over heel haar verloop verschillende septale en diagonale takken. De LAD is meestal de voornaamste coronaire en bevloeit de voorwand (anterior gedeelte) van het linkerventrikel. Occlusie van de LAD kan de pompcapaciteit van het hart met 65% doen dalen [124]. De LCX is verschillend van persoon tot persoon. De LCX kan bestaan uit een hoofdtak (Lat. Ramus Angularis) met één of meerdere marginale takken (Lat. Ateria Obtusa Marginalis) en de Postero-laterale eindtak(ken). De LCX bevloeit voornamelijk de achter zijde (postero-lateraal gedeelte) van het linkerventrikel. Naast een linker splitst ook een rechter coronaire af van de aorta. De Right Coronary Artery of RCA bevloeit voornamelijk het rechterventrikel en het diafragmatisch deel van het linkerventrikel (goed voor 25%- 35% van het linkerventrikel). De Right Marginal Branch of RMB (Lat. Arteria Acuta Marginalis) takt af in het proximale deel van de RCA naar het rechterventrikel en splitst zich in de Right Posterior Descending coronary artery (RPD) en de atrio-ventrikulaire tak welke eindigt in postero-laterale takken. In 15% van de gevallen wordt de RPD echter door de LCA geleverd.

RUG01-001312156_2010_0001_AC.pdf (ugent.be)


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https://libstore.ugent.be/fulltxt/RUG01/001/312/156/RUG01-00...

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Obviously, we are talking about coronary arteries here: echocardiogram; LAD.

'[ramus] angularis' as a name for the LCx main branch seems to be a term that is used for the LCx in Belgium only.

I have never seen this use in Dutch.

See reference:
De LCX kan bestaan uit een hoofdtak (Lat. Ramus Angularis) ...
The LCx may consist of a main branch (in Latin 'ramus angularis' [angular branch]) ...

You won't find 'ramus angularis' in Pinkhof (NL dictionary of medical terms and their definitions)

The LCx is called this in Pinkhof in Latin:
ramus circumflexus arteriae coronariae sinistrae:
- tak van de linker coronaire arterie (LCA), loopt in de sulcus coronarius naar de achterkant van de linker hartkamer, verzorgt linkerkamer en boezem
--> left coronary artery (LCA) branch, runs through the coronary sulcus to the back of the left ventricle, supplies left ventricle and atrium


On cardiology sites you find 'ramus circumflexus' (rather than 'ramus angularis)

For example:

B. Cx (Ramus Circumflexus), de omcirkelende zijtak van de linker kransslagader.

https://www.hartwijzer.nl/hartkatheterisatie

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Basically the 'main branch of the LCx' can be understood to mean the LCx without its side branches, namely the obtuse marginals and left posterolaterals.

Which means, you could simply use 'LCx' instead of 'LCx main branch'

I expect the stenosis will be in the proximal part, but we can't be sure.
LCx stenoses are often differentiated according to their location: ostial / proximal / mid / distal LCx stenosis.
So let's leave the specific location aside.

I think you could responsibly translate your phrase as follows:

Matige stenose LAD en significante stenose angularis.

Moderate LAD stenosis and significant LCx stenosis.

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Second option for 'ramus angularis'.

Multidisciplinair cardiologisch kwaliteitshandboek
AZ Sint-Maarten

Search for "Ramus Angularis"
You'll find '16. Ramus Angularis'.
Look for '16' in the accompanying image.
You will see a branch in dotted outline where where the LCA divides in the LCx and LAD.

https://www.azsintmaarten.be/sites/azsintmaarten/files/2018-...

The term 'ramus angularis' is not used for this artery in the Anglo-Saxon literature.

It is mostly called 'intermediate artery / branch'.

In the following documents images are provided for the 'intermediate artery / branch', which is located in the same place as the 'ramus angularis' in the image of the ref above.

This branch is called 'intermediate artery or anterolateral artery' in the SYNTAX score document. See image/diagram.

https://www.researchgate.net/publication/26816591_The_SYNTAX...

Called 'intermediate branch' in the following document (+ image):

In 15% of cases a third branch arises in between the LAD and the Cx, known as the ramus intermedius or intermediate branch.
This intermediate branche behaves as a diagonal branch of the Cx.

https://radiologyassistant.nl/cardiovascular/anatomy/coronar...

Also called 'intermediate artery / branch' in Wiki

Sometimes a third branch is formed at the fork between left anterior descending and left circumflex arteries, known as a ramus or intermediate artery.

https://en.wikipedia.org/wiki/Coronary_arteries#:~:text=Some...

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ramus intermedius / intermediate branch

Instead of bifurcating into the LAD and LCx arteries, in 10 to 15% of patients, the LM trifurcates into the LAD, LCx, and ramus intermedius arteries 1 ,​ 3 (Fig. 18‑2). The ramus may arise directly from the LM artery (trifurcation) or near the orifice of the LAD or the LCx. Therefore, the ramus may actually be considered the first branch of the LAD or the LCx when arising from these vessels.

https://radiologykey.com/18-coronary-arteries-and-myocardial...