Unveiling Complexity: Black Pleural Effusion Due to a Pancreaticopleural Fistula

Black pleural effusions (BPEs) are an exceedingly rare class of exudative effusions of unexplored causality. Their characteristic pitch-black coloring and striking first appearance upon thoracocentesis make them a bewildering occurrence even for seasoned physicians. Forming a free-from-error diagnostic work-up can be arduous and largely depends on thorough history-taking, deliberate imaging studies, and the correct biochemical profile. The upcoming article aims to raise awareness of this pathology by presenting our experience with a BPE after an episode of acute-on-chronic (ACP) pancreatitis and the confounding route to achieving the correct diagnosis and forming the precise therapeutic approach to this scenario. Keeping in mind that this is not a common clinical case, we strive to dispel some misconceptions and thus avoid any subsequent complications and delays in diagnosis when treating this type of effusions and their underlying pathology.