However , in 15 % of cases , the arthritis is symmetrical .
Asymmetrical oligoarthritis , defined as inflammation affecting one to four joints during the first six months of disease , is present in 70 % of cases .
In 15 % of cases , the arthritis is symmetrical .
Asymmetrical oligoarthritis , defined as inflammation affecting one to four joints during the first six months of disease , is present in 70 % of cases .