The 26-year-old Briton – who tested for Williams at the Abu Dhabi Young Driver test (pictured) – has had to withdraw from the Formula Renault 3.5 championship, having just been signed alongside Toro Rosso test driver Daniel Ricciardo at the ISR outfit.
Doctors have thankfully diagnosed the condition early, according to sources, and with treatment to begin immediately, they are confident he can make a full recovery.
Stoneman has declared he intends to return to motorsport activity as soon as he is well enough to do so.
It is not the first time that this condition has hit motorsport circles, with the most high-profile case being former Lotus race-winner Gunnar Nilsson, who died in 1978 at the age of 29 from the same diagnosis.
The Richard’s F1 team wishes Dean a speedy recovery.
[Original image via LAT]