CTICasesType A Aortic Dissection with Pulmonary Artery Blood Sheath
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Imaging findings
CT angiogram demonstrated a Type A aortic dissection involving the ascending aorta, extending as a distinct blood sheath between the ascending aorta and the pulmonary artery, and further into the lower lobes along their common adventitial plane. A prominent hemopericardium was also present.
Key takeaways
Type A aortic dissection is a life-threatening emergency. The ascending aorta and pulmonary artery share a common adventitial plane during embryogenesis, which can serve as a conduit for dissection to spread into the pulmonary artery, forming a characteristic 'blood sheath' on imaging. Associated hemopericardium indicates a high risk of rupture and tamponade.
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