Suffered dislocated shoulder without knowing went in on its own. What would a MRI show to lead to the diagnosis of dislocated shoulder from orthopedist?

Multiple findings. Learn more about unstable shoulder here: http://theshouldercenter.Com/unstable-shoulder.Htm multiple areas of the shoulder can be injured with a shoulder dislocation or even multiple episodes of subluxation/instability. The decision for the best treatment has to be individualized and depends on many factors.
Hx first. First i would believe the patient, then i would look for bone bruising called a hill-sachs lesion or a labral tear called a bank art lesion.