Summary

We report the case of a 70-year-old woman with a surgically treated pulmonary sclerosing haemangioma that clinically and radiologically mimicked a thrombosed pulmonary artery aneurysm. She underwent intravenous thrombolytic therapy because of acute pulmonary embolism in the bilaterally segmental arteries. The pulmonary embolism had almost disappeared except for a nodular lesion in the middle lobe branch of the pulmonary artery, and a thrombosed pulmonary artery aneurysm with thrombus was suspected in the CT image. The patient underwent a video-assisted thoracoscopic middle lobectomy. The final pathological diagnosis was sclerosing haemangioma. She had experienced no recurrence for 1 year after surgery, and we continue to take great care during her follow-up.