TY - JOUR AU - Chong, S.G. AU - Chauhan, Z. AU - Di Nino, E. AU - Brien, A.O. AU - Casserly, B.P PY - 2015/12/03 Y2 - 2024/03/28 TI - Effusion under the microscope JF - Monaldi Archives for Chest Disease JA - Monaldi Arch Chest Dis VL - 77 IS - 1 SE - Case Reports DO - 10.4081/monaldi.2012.166 UR - https://www.monaldi-archives.org/macd/article/view/166 SP - AB - Pseudochylothorax is a very rare form of pleural effusion. It is also called chyliform or cholesterol pleural effusion. It is usually a unilateral process and approximately one-third of patients are asymptomatic at presentation. We report a case of a 60 year old man with a background of rheumatoid arthritis who presented with progressive dyspnea. Chest X-ray revealed a new left pleural effusion and a small persistent right pleural effusion. He presented 5 years prior due to recurrent pleural effusion and no diagnosis was made. Repeat thoracentesis yielded 350 milliliters of thick, milky, tan-colored fluid. ER -