Parsonage Turner Syndrom(syndrome)

Four years ago my shoulder developed intence pain and then it got extremely weak. The scapula was winging out and I lost deffinition in my lattisma muscle. I was diagnosed with Bracial Plexitis, or " Parsonage Turner Syndrom (syndrome)". The Neurologist said it should subside in a year. four years later I don't have the chronic pain but I still don't have strength in my sholder when I push out or up. and my Lat is still missing. Could this be a miss diagnosis of some other injury like a pinched nerve?