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Acromioclavicular Joint Cyst – the Geyser Phenomenon

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Raquel Araújo
Diogo Costa
Nuno Ramalhão
Ana Zão
Acromioclavicular Joint, Cysts, Rotator Cuff Injuries

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De Maio F, Di Marcantonio A, De Luna V, Caterini A, Tresoldi I, Farsetti P. Synovial cyst of the acromioclavicular joint with and without rotator cuff tear: A case series of two patients. Int J Surg Case Rep. 2020;75:390-3. doi:10.1016/j.ijscr.2020.09.084.

Seet D, Manohara R, Hallinan JT, Tay SH. Geyser sign: biomechanics and clinical implications. Ann Acad Med Singap. 2020;49:621-5.

Singh RA, Hay BA, Hay SM. Management of a massive acromioclavicular joint cyst: the geyser sign revisited. Shoulder Elbow. 2013;5:62–4.

Tshering 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. doi: 10.1007/s00256-004-0883-6.