This study describes a 64-yr-old male with a chronic left pleural effusion following a coronary artery bypass 3 yrs earlier. On thoracocentesis, turbid fluid was obtained with crystals of cholesterol on microscopic examination, establishing the diagnosis of pseudochylothorax. The pleural fluid cholesterol level was 207 mg x dL(-1) (5.36 mmol x L(-1)). This is the first report of pseudochylothorax in a chronic pleural effusion due to coronary artery bypass surgery.