Frozen shoulder (Adhesive capsulitis)

Limited capacity to inject
Small axillary fold
Irregularity of anterior capsular insertion at humeral neck

MR arthorgraphy:
Thick axillary recess > 4 mm on oblique coronal
Smaller volume of the axillary recess
Thick joint capsule: at rotator interval > 7 mm
Thick CHL > 4 mm
Subcoracoid triangle sign:  obliteration of fat triangle between CHL and coracoid process
Synovitis like abnormality in the rotator cuff tendons

Mengiardi B et al; Frozen Shoulder: MR Arthrographic Findings; November 2004 Radiology, 233, 486-492. 
Eric W et al. Adhesive Capsulitis of the Shoulder: MR Diagnosis;AJR 1995