MRI findings in calcific deposits in and around shoulder: atypical locations beyond supraspinatus.

Hydroxyapatite deposition disease is a spectrum of disorders including calcific tendinitis, calcific periarthritis, and hydroxyapatite-induced arthritis. These usually present with acute onset of pain, and clinically, may be confused with acute infection or adhesive capsulitis. Supraspinatus calcific tendinitis and its imaging appearance is well known; however, calcific deposits may occur less commonly in other structures in and around the shoulder joint. We describe nine cases of relatively uncommon locations of calcific deposits around the shoulder with their imaging appearances.