My husband had an mri and just found out he has scheuermann syndrome. what is best coarse of treatment?

Kyphosis: The spine has natural curves, but a kyphosis is an exagerated bend curving forward, causing a stooped appearance. Multi-factorial. I'd see a rheumatologist to r/o ankylosing spodylitis, and an orthopedist to determine what if anything should be done.

Maybe nothing: Scheurmann's disease is a specific type of kyphosis (hunchback). It results in deformity, much the same way scoliosis does. It can lead to pain and degenerative disease in adulthood which may require surgery, but in general treatment is symptomatic.