[Tuberculous pleural effusions].

Tuberculous pleural effusion is a common manifestation of the primary form of the disease or consequence of the reactivation of a latent infection due to the M. tuberculosis. Advances in the laboratory methods have contributed to better diagnose and understand the pathophysiology of the effusion secondary to tuberculosis. However, although a predominant lymphocytic pleural effusion is suspicious of tuberculosis, a diagnostic routine shall be instituted to orient treatment and prevent undesirable sequels.