Hi,
From what I’ve read and researched over the last few months, medical conditions are assessed firstly on risk to public e.g hiv, tb
and secondly on cost to Australia government. This is generally assessed over the length of the visa, so I’d be very surprised if it’s a problem, as technically your visa is classed as temporary.
i would get a specialist report from your specialist, detailing prognosis and as much information as possible.
all the best