Sjögren syndrome is a clinicopathologic entity characterized by dry eyes
(keratoconjunctivitis sicca) and dry mouth (xerostomia), resulting
from immune-mediated destruction of the lacrimal and salivary glands. It occurs
as an isolated disorder (primary form), also known as the sicca syndrome,
or more often in association with another autoimmune disease (secondary form).
Among the associated disorders, RA is the most common, but some patients have
SLE, polymyositis, systemic sclerosis, vasculitis, or thyroiditis.
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