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GENERAL PURPOSE: To provide information about Geyser phenomenon of the shoulder, using a case study to illustrate.


LEARNING OBJECTIVES/OUTCOMES: After completing this continuing education activity, you should be able to:


1. Identify the components of Geyser phenomenon of the shoulder and its clinical presentation.


2. Explain the diagnosis and treatment of this rare condition.



1. Cysts of the acromioclavicular (AC) joint associated with chronic rotator cuff pathology are classified as


a. Type 1.


b. Type 2.


c. atypical ganglion cysts.


2. Which of the following accurately describes Geyser phenomenon or Geyser sign?


a. Imaging reveals fluid erupting through the AC joint.


b. It always presents as shoulder pain, with or without a palpable mass.


c. It involves a Type 1 cyst of the AC joint.


3. The primary complaint of the patient in the case study was


a. chronic shoulder pain.


b. limited range of motion.


c. a shoulder "lump."


4. Narrowing of the acromiohumeral interval on imaging is primarily indicative of


a. a labral tear.


b. Geyser phenomenon.


c. chronic rotator cuff pathology.


5. The preferred primary diagnostic imaging tool in the evaluation of soft tissue masses is


a. magnetic resonance imaging.


b. sonography.


c. computed tomography scan.


6. The use of contrast in evaluation of a soft tissue mass of the shoulder is most valuable for determining


a. exact size and location.


b. malignancy.


c. resectability.


7. A finding of rounded lesion with only rim enhancement is consistent with a


a. solid mass.


b. cyst.


c. malignant tumor.


8. The constellation of findings known as Geyser phenomenon includes all of the followingexcept


a. subscapular bursitis.


b. chronic labral tearing.


c. glenohumeral joint degeneration.


9. Evidence-based treatment to address Geyser phenomenon includes


a. excision of the cyst with delayed joint repair.


b. surgical treatment of underlying pathology at the time of cyst excision.


c. treating the patient symptomatically, starting with physical therapy.


10. In the instance where a solid tumor is found on imaging without contrast, the next intervention should be


a. excision of the tumor.


b. fine needle aspiration biopsy.


c. referral to an orthopedic oncologist.