Bronchoscopic diagnosis of sarcoidosis

Transbronchial lung biopsy (TBLB), transbronchial needle aspiration (TBNA) of mediastinal lymph nodes and bronchoalveolar lavage (BAL) are routinely performed at fibreoptic bronchoscopy. Up to the present time, no data have been available on the efficacy of performing all three of these procedures simultaneously in the bronchoscopic work-up of sarcoidosis. A prospective study was undertaken to compare the diagnostic yield from TBLB, TBNA and BAL in patients presenting with clinical and radiological features typical of sarcoidosis. Thirteen consecutive patients with clinical and radiological features consistent with stage I and II sarcoidosis underwent bronchoscopy with TBLB, TBNA and BAL. Noncaseating granulomata (stain and culture negative for tuberculosis bacilli and fungi) were found in seven of the 13 patients by TBLB, and in six of the 13 patients by TBNA (of which four patients had negative TBLB). Eight of the 13 patients had classical "sarcoid" BAL findings, i.e. >12% lymphocytes, and high CD4+:CD8+ lymphocyte ratio. Combining TBLB, TBNA and BAL gave a diagnostic sensitivity of 100% (12 out of 12 patients) for sarcoidosis. The remaining patient had nondiagnostic bronchoscopic studies and mediastinoscopy biopsy showed a non-Hodgkin's lymphoma. Our data suggest that performing simultaneous transbronchial lung biopsy, transbronchial needle aspiration and bronchoalveolar lavage produces optimal results in the diagnosis of sarcoidosis.

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