[Diagnostic value of closed thorax pericardial biopsy. 20 cases].

Twenty patients with sub-acute and chronic pericarditis under went closed thorax pericardial biopsy. In three cases the examination brought to light a diagnosis of tuberculosis and in one of a tumoural origin. In 16 cases in which the aetiology was that of a non-specific pericarditis, the value of this examination, integrated into the context, is discussed.