A 79-year old male with angina underwent emergent coronary artery bypass graft. After the induction of anesthesia, a pulmonary artery catheter (PAC) was placed via the right subclavian vein. At weaning from cardiopulmonary bypass, the pulmonary artery wave form did not appear on the monitor. We pulled and pushed the PAC repeatedly. However, we could observed no pulmonary artery pressure; the PAC was not pulled out at the 42 cm from the distal tip. Chest X-ray revealed a malposed PAC into the ipsilateral internal jugular vein. No deleterious complications were observed either during the immediate or later postanesthetic period.