Pulmonary artery aneurysm
 Discussion of Pulmonary artery aneurysm
- Aneurysms or pseudoaneurysms of the pulmonary arteries, whether congenital or acquired, are rare.
- They may occur in association with a congenital cardiovascular anomaly (i.e. patent ductus arteriosus), infection (mycotic aneurysm); trauma (i.e. due to improper placement of a catheter), vascular abnormality (i.e. cystic medial necrosis, Behçet disease, Marfan syndrome, and Takayasu arteritis), and pulmonary hypertension.
- In appropriate clinical settings, an aneurysm or pseudoaneurysm should be suspected in patients who present with hemoptysis or in whom chest radiography shows hilar enlargement or a new focal lung mass that has stable or increased size at subsequent radiographic examination.
- Early diagnosis is crucial as the mortality rate for patients with a ruptured pulmonary artery aneurysm is 100%.
 Imaging Findings for Pulmonary artery aneurysm
- Helical CT is considered the noninvasive imaging modality of choice for the work-up of patients suspected of having pulmonary artery aneurysm, prior to therapeutic interventions (embolization or surgery).
- Contrast-enhanced CT allows assessment of the presence, size, and location of the aneurysm; aneurysms appear as saccular or fusiform areas of dilatation, with homogeneous contrast material filling that occurs simultaneously with that in the pulmonary artery.
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 References for Pulmonary artery aneurysm
- Eva Castañer, Xavier Gallardo, Jordi Rimola, Yolanda Pallardó, Josep M. Mata, Joan Perendreu, Cesar Martin, and Damian Gil. Congenital and Acquired Pulmonary Artery Anomalies in the Adult: Radiologic Overview. RadioGraphics 2006 26: 349-371.