The 26-year-old had tests when at home in Australia for Christmas and was diagnosed with the eye tumour.
Dureau told BBC Sport."I had some eye tests done and it wasn't quite glasses that I needed, it was a tumour behind the eye that was causing the problem.
"It was very scary at the time, I was in complete shock when I first found out, it wasn't something I expected, it was very intense and shocking.
"The best thing was I was with my family and friends - as much as it was uncomfortable, it was a comfort knowing my family and friends were around me."
Thankfully, the surgery was successful and Dureau is aiming at a return to the Dragons' first team after surgeons confirmed he was able to return to training last month.
He added."I feel pretty good, I've been doing some training the last five or six days now, getting back into the swing of things in the gym and a little bit out on the field with the boys,"
"I came straight to training to see the boys who were all there and it was a good feeling, all of the boys were happy to see me and it was quite emotional."
Catalans have maintained progress under head coach Laurent Frayssinous, and with three wins from five games they are looking to better last term's position of fourth.
Patience will be the biggest challenge for Dureau, not just now but in years to come.
He continued."There hasn't been a timeframe [on returning to action], it'll be a bit of 'how I feel' and a pretty slow process.
"At this stage, at the scan the other day it was all-clear, there was no sign of the tumour, which is as good as we can hope for. Hopefully, nothing will grow back."
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