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Shoulder Normal Variants and Imaging Pitfalls
B.J. Manaster, MD, PhD, FACR
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Imaging Pitfalls

  • Magic Angle Phenomenon on MR

    • Interdigitation of Muscle or Fibrous Tissue Between Supraspinatus and Infraspinatus Tendons

      • Volume Averaging of Rotator Interval Contents on Coronal Oblique Images

        • Normal Flattening or Slight Concavity of Posterolateral Humeral Head

          • Acromial Pseudospurs Mimicking Osteophytes

            • Normal Residual Red Bone Marrow in Glenoid and Proximal Humeral Metaphysis Can Mimic Neoplastic Process

              • Anterolateral Branch of Anterior Circumflex Humeral Artery & Vein in Lateral Bicipital Groove

                • Hyaline Cartilage Undercutting of Superior Labrum Simulating Labral Tear

                  • Vacuum Effect Simulating Loose Bodies or Chondrocalcinosis

                    • General Imaging Artifacts

                      Normal Variants

                      • Osseous

                        • Labrum

                          Selected References

                          1. Wilson WR et al: Variability of the capsular anatomy in the rotator interval region of the shoulder. J Shoulder Elbow Surg. 22(6):856-61, 2013
                          2. Vinson EN et al: MRI of selected abnormalities at the anterior superior aspect of the shoulder: potential pitfalls and subtle diagnoses. AJR Am J Roentgenol. 199(3):534-45, 2012
                          3. Tischer T et al: Arthroscopic anatomy, variants, and pathologic findings in shoulder instability. Arthroscopy. 27(10):1434-43, 2011
                          4. Shortt CP et al: Association of glenoid morphology and anterosuperior labral variation. J Comput Assist Tomogr. 33(4):584-6, 2009
                          5. Ilahi OA et al: Classification of anterosuperior glenoid labrum variants and their association with shoulder pathology. Orthopedics. 31(3):226, 2008
                          Related Anatomy
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                          Related Differential Diagnoses
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                          References
                          Tables

                          Tables

                          Imaging Pitfalls

                          • Magic Angle Phenomenon on MR

                            • Interdigitation of Muscle or Fibrous Tissue Between Supraspinatus and Infraspinatus Tendons

                              • Volume Averaging of Rotator Interval Contents on Coronal Oblique Images

                                • Normal Flattening or Slight Concavity of Posterolateral Humeral Head

                                  • Acromial Pseudospurs Mimicking Osteophytes

                                    • Normal Residual Red Bone Marrow in Glenoid and Proximal Humeral Metaphysis Can Mimic Neoplastic Process

                                      • Anterolateral Branch of Anterior Circumflex Humeral Artery & Vein in Lateral Bicipital Groove

                                        • Hyaline Cartilage Undercutting of Superior Labrum Simulating Labral Tear

                                          • Vacuum Effect Simulating Loose Bodies or Chondrocalcinosis

                                            • General Imaging Artifacts

                                              Normal Variants

                                              • Osseous

                                                • Labrum

                                                  Selected References

                                                  1. Wilson WR et al: Variability of the capsular anatomy in the rotator interval region of the shoulder. J Shoulder Elbow Surg. 22(6):856-61, 2013
                                                  2. Vinson EN et al: MRI of selected abnormalities at the anterior superior aspect of the shoulder: potential pitfalls and subtle diagnoses. AJR Am J Roentgenol. 199(3):534-45, 2012
                                                  3. Tischer T et al: Arthroscopic anatomy, variants, and pathologic findings in shoulder instability. Arthroscopy. 27(10):1434-43, 2011
                                                  4. Shortt CP et al: Association of glenoid morphology and anterosuperior labral variation. J Comput Assist Tomogr. 33(4):584-6, 2009
                                                  5. Ilahi OA et al: Classification of anterosuperior glenoid labrum variants and their association with shoulder pathology. Orthopedics. 31(3):226, 2008