Adult Onset Still's Disease and Still's Disease in the child, what's the difference there? Well not much! They are believed to be the same disease. The difference is the age at which you get the disease. Still's Disease was originally named for a specific type of jra, called systemic jra. Jra has 3 classifications, poly-articular, paui-articular, and systemic. The systemic form of jra became known also as Still's Disease. In 1971, a doctor recognized the same symptoms in adults. Their disease also began in adulthood, not when they were a child. These patients were given the diagnosis of Adult-Onset Still's Disease, referring to the fact that they were adults at the time of the onset of Still's.
Most Rheumatologist's characterize the age for AOSD as ages 17 and older at onset, with the majority being 18-35. If you are 16 or younger at the time of onset it's considered systemic jra, or Still's Disease.
There is one symptom however that is more prevalent in AOSD and that is a severe sore throat. Most adult members of the group report having the sore throat right before or at their onset. The sore throat doesn't seem to be a big factor with the children. Dr. Cush has noted this difference in one of his studies.
Systemic Jra is rare, it's seen in approximately 20% of all cases of jra. AOSD is even more rare and unfortunately many doctors are not familiar with it. Many cases of Adult Still's go undiagnosed for years. This is one of the things we hope to change.
Comparison of clinical
features of childhood and adult onset
Tanaka S Matsumoto Y
On the basis of these
data, we conclude that CHSD and AOSD are of the same disease entity so far as the
present clinical features are concerned.
Clinical study of Still's disease as a distinct disease entity
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