MR imaging of the subcoracoid bursa

Area of Science:

• Radiology
• Anatomy
• Orthopedics

Background:

• The subcoracoid bursa is an anatomical structure anterior to the shoulder joint.
• Its identification on MR imaging is crucial for diagnosing shoulder pain.
• This bursa can communicate with the subacromial-subdeltoid bursa.

Purpose of the Study:

• To describe the MR imaging appearance and location of the subcoracoid bursa.
• To determine the frequency of subcoracoid bursa visualization on MR imaging.
• To assess the association between the subcoracoid bursa and the subacromial-subdeltoid bursa.

Main Methods:

• Review of 1545 shoulder MR imaging reports from June 1993 to February 1998.
• Detailed review of 16 cases describing a subcoracoid bursa.
• Comparison of MR imaging findings with subscapular recess (glenohumeral joint outpouching).

Main Results:

• The subcoracoid bursa was identified in 9 out of 1545 (0.6%) shoulder MRIs.
• A total of 11 cases (including 2 from teaching files) were analyzed.
• Fluid was present in 45% (small) and 55% (moderate/large) of identified bursae.
• Communication with the subacromial-subdeltoid bursa was observed in 55% of cases.

Conclusions:

• Correct identification of the subcoracoid bursa on MR imaging is important for diagnosing isolated shoulder pain.
• Fluid within the subcoracoid bursa can communicate with the subacromial-subdeltoid bursa.
• Understanding this anatomical relationship aids in accurate diagnosis and patient management.