Acromioclavicular joint cyst: nine cases of a pseudotumor of the shoulder

Tshering Vogel, DW; Steinbach, LS; Hertel, R; Bernhard, J; Stauffer, E; Anderson, SE (2005). Acromioclavicular joint cyst: nine cases of a pseudotumor of the shoulder. Skeletal radiology, 34(5), pp. 260-5. Berlin: Springer-Verlag 10.1007/s00256-004-0883-6

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OBJECTIVE: (1) To analyse the imaging appearances of nine patients with acromioclavicular joint cysts presenting as shoulder masses for tumor staging with operative, histopathological and joint aspiration findings.DESIGN AND PATIENTS: Retrospective review of imaging and correlation with clinical, operative and surgical notes. Images were reviewed by two musculoskeletal radiologists by consensus. Nine patients who presented clinically with a shoulder mass were evaluated by radiographs (n=9), ultrasound (n=1), conventional arthrography (n=3), MRI (n=6; with direct MR arthrography n=2, indirect MR arthrography n=4).RESULTS: All patients had a focal mass superior to the AC joint, with a size ranging from 1.5 cm to 6 cm and a mean of 3.27 cm. Correlation was available with surgery (n=7), histopathology (n=2) and cyst aspiration (n=2). Two patients were managed conservatively. Geyser sign was positive in all three arthrograms. All MRIs revealed extensive rotator cuff tears with a column of fluid extending from the glenohumeral joint through the rotator cuff tear into the acromioclavicular joint and acromioclavicular cyst. Chondrocalcinosis was seen in the acromioclavicular joint cyst (n=2) and in the glenohumeral joint (n=1). Aspirate in two patients contained calcium pyrophosphate dihydrate crystals.CONCLUSION: Acromioclavicular joint cysts may present as a tumor mass. They are associated with extensive rotator cuff tears and there is usually communication of the cyst with the joint space. This feature excludes a diagnosis of tumor. AC joint cysts may be associated with calcium pyrophosphate dihydrate deposition disease.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Radiology, Neuroradiology and Nuclear Medicine (DRNN) > Institute of Diagnostic, Interventional and Paediatric Radiology

UniBE Contributor:

Tshering Vogel, Dechen Wangmo

ISSN:

0364-2348

ISBN:

15723212

Publisher:

Springer-Verlag

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:51

Last Modified:

23 Oct 2019 08:44

Publisher DOI:

10.1007/s00256-004-0883-6

PubMed ID:

15723212

Web of Science ID:

000228533400002

BORIS DOI:

10.7892/boris.21557

URI:

https://boris.unibe.ch/id/eprint/21557 (FactScience: 7422)

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