Cardiac involvement in<unk> 's<unk>  is not as uncommon as generally thought, and ranges in prevalence from 6 to 44% of patients. It may take many forms and varies from the principal clinical manifestation of the disease to a mild or subclinical manifestation of the disease. Cardiac involvement should be actively sought in patients with<unk> 's<unk>  and should be considered in patients with non specific illness.
The heart in Wegener's granulomatosis
The heart in Behçet's disease
The heart in sarcoidosis
The heart in temporal arteritis / giant cell arteritis
The heart in progressive systemic sclerosis 
The heart in essential mixed cryoglobulinemia
The heart in rheumatoid arthritis
The heart in juvenile rheumatoid arthritis