[Pulmonary pseudosequestration receiving arterial supply from the right coronary artery: a case report].

A 66-year-old female had been treated by hemodialysis since 1996. She was admitted to our hospital with acute pneumonia in January 2001. During admission, ischemic heart disease was identified. Her condition deteriorated and organic pneumonia of the right middle lobe progressed. She recovered after 6 months and coronary arteriography was performed. A 90% stenosis was detected at the ostium of the right coronary artery. An aberrant tortuous artery arose from the distal sinus node artery, and drained into the lung network, but also partially drained to the right segmental pulmonary artery branch. The diagnosis was significant stenosis of the right coronary artery, and pulmonary pseudosequestration or pulmonary sequestration receiving arterial supply from the sinus node artery. Surgical revascularization, ligation of the aberrant artery, and partial resection of the right middle lobe were performed. However, intraoperative findings did not identify the pulmonary sequestration. This rare case of pulmonary pseudosequestration received the arterial supply from the sinus node artery, originating from the right coronary artery with a significant stenotic lesion, and developed without recurrent pneumonia.