Puberty is usually delayed, and males may have undescended testicles and a small penis . Adult height is usually decreased. Testing will depend on the symptoms present. For example, if there are signs of heart disease, an ECG or chest X-ray may be recommended. There is no single treatment for Noonan syndrome.
Treatment focuses on the problems that occur.
The expected outcome depends on the extent and severity of symptoms that are present. Mental retardation , if present, is usually mild. However, some syndromes include pectus excavatum.