Unilateral Pleural Effusions with More Than One Apparent Etiology. A Prospective Observational Study

Evaluation of a pleural effusion has historically focused on establishing a single etiology. Pleural fluid may accumulate through multiple pathophysiological processes. The prevalence of multiple causes for pleural effusions has not been established. The identification of contributing processes may improve clinical outcomes.The objective of this prospectively collected case series was to establish the prevalence and nature of multiple etiologies...