Vasculitis and collagenous-vascular involvement in association with sarcoidosis

Sarcoidosis is a systemic granulomatous disorder of unknown origin. It unusually complicates systemic vascular involvement. We concisely review clinico-pathological findings of vascular involvement, including granulomatous angitis and microangiopathy. The clinical features of sarcoidosis may mimic those of many rheumatic disorders and sarcoidosis may coexist with autoimmune diseases. We review both rheumatologic manifestations, including bone, joint, and muscle of sarcoidosis and immunological findings of autoimmune diseases complicated with sarcoidosis, including 2-case reports of Sjögren's syndrome and dermatomyositis/polymyositis.