The case is reported of non-bacterial thrombotic endocarditis (NBTE) in a patient with giant cell arteritis and prostate cancer, and the relevant literature reviewed. To the present authors' knowledge, this is the first case to be reported where NBTE coexists with both arteritis and cancer. NBTE is difficult to diagnose if the underlying disease is accompanied by fever. If a diagnosis of probable infective endocarditis is established, the cultures and serology are negative, and there is no response to antibiotic treatment, then NBTE should be considered.
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