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Filling Defect in a Pulmonary Arterial Stump on CT After Pneumonectomy: Radiologic and Clinical Significance

So Yeon Kim1, Joon Beom Seo1, Eun Jin Chae1, Kyung-Hyun Do1, Jin Seong Lee1, Jae-Woo Song1, Koun-Sik Song1 and Tae-Hwan Lim1

1 Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 388-1, Pungnap-2dong, Songpa-gu, Seoul 138-736, South Korea.



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  		Fig. 1 —59-year-old man after right pneumonectomy for squamous cell carcinoma of lung. Method to measure length of pulmonary arterial stump is shown. Distance between origin of right or left pulmonary artery and end of stump (biheaded arrow) is defined as length of pulmonary arterial stump after pneumonectomy. CT scan obtained 16 months after pneumonectomy shows flat filling defect at end of pulmonary arterial stump, presumed to be in situ thrombus.

 


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  		Fig. 2A —68-year-old man with right pneumonectomy for squamous cell carcinoma. CT scan obtained 18 months after pneumonectomy shows polypoid filling defect (arrowheads) in pulmonary arterial stump.

 


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  		Fig. 2B —68-year-old man with right pneumonectomy for squamous cell carcinoma. CT scan obtained 23 months after pneumonectomy shows lesion (arrowheads) has decreased in size and become flat; these findings suggest partial resolution of in situ thrombus.

 


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  		Fig. 2C —68-year-old man with right pneumonectomy for squamous cell carcinoma. Thrombus is not seen on CT scan obtained 30 months after pneumonectomy.

 

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