A patient after having had heart surgery for pulmonary and tricuspid valve disease; treated with bioprosthesis. After the operation, development of postpericardiotomy syndrome - recurrent fluidothorax on the left.

The ultrasound examination showed hyperechoic fluidothorax on the left with compressive atelectasis in part of the lung. A pleural puncture resulted in straw yellow effusion, biochemical of transudate character, cytology mesothelial effusion.