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Introduction
Tuberculous pleurisy (TBP) is one of the most common manifestations of extra‐pulmonary tuberculosis. In patients aged ≥40 years, a closed needle pleural biopsy is recommended with an adenosine deaminase (ADA) level of 40‐70 U/L. We aim to investigate whether the cutoff value of ADA and the cancer ratio in patients with TBP aged ≥40 years is different and determine the effects of both...