'Today, it still remains palpable but my general practitioner does not seem worried.
Do you think I can “close the case” and move on?'
Bonsoir. Yes, there is every reason (those you have stated) to believe that it is benign. You can forget about it.
What follows is simply more information, if you are interested:
It has not enlarged any more, and others have not appeared. That is also good.
If it stays enlarged, then that probably would only be due to fibrosis (scar tissue) inside. That can take a very long time to be gone, if ever. Yet it is still not-cancer.
If it stays enlarged and is *tender* then that probably means that some immune system reaction is still taking place. But it is still not-cancer.
I risk adding worry to you, sorry... but if you ever in future have any odd or mystery conditions, then you should consider that whatever made this node enlarge could also be responsible for any new mystery symptoms. That connection would be immune system related, NOT cancer related.
Congratulations on having acquired so much understanding about your case. Bon chance.