I wanted to edit my post next day,but it won't let me.
I meant ,with thymoma- sternotomy is recommended ( not transcervical,which is " via your neck",when it's only gyperplasia ot just normal size thymus present). Sternotomy, most hard one- that what my daughter had.....Turned out ,it was gyperplasia...More tests,more opinions, more research- that could help you to decide which way to go.