1. Vogel DW, Steinbach LS, Hertel R, Bernhard J, Stauffer E, Anderson SE. Acromioclavicular joint cyst: Nine cases of a pseudotumor of the shoulder. Skeletal Radiol 2005;34:260–5.
2. Singh RA, Hay BA, Hay SM. Management of a Massive Acromioclavicular Joint Cyst: The Geyser Sign Revisited. Shoulder & Elbow 2013;5:62–4.
3. Tan RK. A Review of the Role of Magnetic Resonance Imaging in the Evaluation of Shoulder Impingement Syndrome and Rotator Cuff Tendon Tears. Ann Acad Med Singapore 1998;27:243–7.
4. Kumar VP. Biomechanics of the Shoulder. Ann Acad Med Singapore 2002;31:590–2.
5. Cooper HJ, Milillo R, Klein DA, DiFelice G. The MRI geyser sign: acromioclavicular joint cysts in the setting of a chronic rotator cuff tear. Am J Orthop (Belle Mead NJ) 2011;40:E118–21.