Primary Outcome Measures:
- Assessment of PA in Alagille Patient [ Time Frame: Open ]
The investigators hope to learn the degree and characteristics of pulmonary artery stenosis in Alagille Syndrome. We also hope to learn the effect of this pulmonary artery stenosis on the right ventricle in patients with Alagille Syndrome. This information is critical in the management of patients with Alagille syndrome, as there is currently no data to guide clinicians on the management of pulmonary artery stenosis. Furthermore, the information from this study may help physicians manage pulmonary artery stenosis in other patients as well. For the third aim, we hope to learn about the different blood vessel abnormalities in the brain, and which abnormalities are most likely to lead to stroke.