Image of ankle confirmed to be inflammation and in this case inflammation and fluid in the joint from JIA(JIA stands for Juvenile Idiopathic Arthritis).
Juvenile idiopathic arthritis (JIA) or juvenile rheumatoid arthritis (JRA), is the most common form of arthritis in children and adolescents. ("Juvenile" : refers to an onset before age of 16; "idiopathic" : refers to a condition with undefined cause; "arthritis": inflammation of the synovium of a joint.)
JIA is an autoimmune, noninfective, inflammatory joint disease of more than 6 weeks duration in children less than 16 years of age. The disease commonly occurs in children from the ages of 1 to 6, but it may develop as late as 15 years of age. It is a subset of arthritis seen in childhood, which may be transient and self-limited or chronic. It differs significantly from arthritis commonly seen in adults (osteoarthritis, rheumatoid arthritis), and other types of arthritis that can present in childhood which are chronic conditions (e.g. psoriatic arthritis and ankylosing spondylitis). Aetiopathology is similar to rheumatoid arthritis, but with less marked cartilage erosion, and joint instability and absent rheumatoid factor.
JIA affects about one in 1,000 children in any given year, with about one in 10,000 having a more severe form.