Case 2. Magnetic resonance image (MRI) of the left shoulder at symptom onset (a, b) and at the first visit to our hospital (c). (a) T2-weighted MRI (oblique coronal plane) demonstrates joint effusion and a slightly collapsed humeral head. (b) Axial, T1-weighted MRI shows a subchondral serpiginous pattern of low signal intensity with associated bone marrow edema. (c) T2-weighted MRI (coronal view) demonstrates the collapse of the humeral head and an intact rotator cuff.