MedGen

A rare congenital heart malformation of one or more of the aortic sinuses, consisting of a dilation that when unruptured is usually asymptomatic but when ruptured presents with progressive exertional dyspnea, fatigue, chest pain and that can lead to congestive heart failure if left untreated. [from ORDO]

A rare neurologic disease with characteristics of the chronic consequences of bilirubin toxicity in the globus pallidus, sub-thalamic nuclei and other brain regions, after exposure to high levels of unconjugated bilirubin in the neonatal period. Symptoms begin after the acute phase of bilirubin encephalopathy in the first year of life, evolve slowly over several years, and include mild to severe extrapyramidal disturbances (especially dystonia and athetosis), auditory neuropathy spectrum disorder and oculomotor and dental abnormalities. [from SNOMEDCT_US]

Present in 30% to 79% of the cases. [from HPO]

Supravalvular aortic stenosis (SVAS) is a heart defect that develops before birth. This defect is a narrowing (stenosis) of the large blood vessel that carries blood from the heart to the rest of the body (the aorta). The condition is described as supravalvular because the section of the aorta that is narrowed is located just above the valve that connects the aorta with the heart (the aortic valve). Some people with SVAS also have defects in other blood vessels, most commonly stenosis of the artery from the heart to the lungs (the pulmonary artery). An abnormal heart sound during a heartbeat (heart murmur) can often be heard during a chest exam. If SVAS is not treated, the aortic narrowing can lead to shortness of breath, chest pain, and ultimately heart failure.

The severity of SVAS varies considerably, even among family members. Some affected individuals die in infancy, while others never experience symptoms of the disorder. [from MedlinePlus Genetics]