An anteromedial lesion was found on arthroscopy. It was "the size of a finger" according to the surgeon. I still have the original (prior to any surgery) minor complaint of anterolateral impingement. I'm hoping this can be assisted by ultrasound-guided steroid injection and will pursue this course of treatment.
I have lost complete trust of the medical establishment and plan to self-diagnose conditions in the future, since while I am utterly incompetent, I have a higher strike rate (1/1) than doctors (1/5).
Thanks for the advice from you guys and I'll post any updates.