Myositis ossificans of the subscapularis: an unusual case of restricted internal rotation

Calcium hydroxyapatite deposition disease: Imaging features and presentations mimicking other pathologies

OBJECTIVE

Calcium hydroxyapatite depositional disease (HADD) is usually asymptomatic and self-limiting; however, when there is an associated inflammatory process or HADD occurs in an unusual location, it may mimic trauma, infection, or neoplasm. The purpose of this article is to review the imaging features of HADD and how to distinguish it from more worrisome entities that can have similar appearances.

CONCLUSION

An understanding of the presentations of HADD is important to allow early and confident diagnosis. In particular, familiarity with presentations that resemble more ominous pathologies is essential to avoid costly and time-consuming workup or intervention.

Heterotopic ossification following anterior shoulder dislocation

Heterotopic ossification (HO) is the abnormal growth of extraskeletal bone. Joint involvement may result in chronic stiffness and pain causing considerable functional impairment and the inability to perform the activities of daily living. HO affecting the shoulder joint is rare and little is known about its clinical course or treatment. Here, we describe the first reported case of glenohumeral HO following anterior dislocation. This occurred in a 70-year-old man following a fall onto outstretched hand. Due to persistent stiffness and pain at 8 months from initial injury, he underwent plain radiographs and MRI scans that confirmed rotator cuff tear and HO. He was managed conservatively with physiotherapy and non-steroidal anti-inflammatory drugs. At 1-year follow-up, the patient maintains a good functional outcome.

[Circumscribed myositis ossificans of the elbow: about a case]

Circumscribed myositis ossificans (CMO) is a heterotopic ossification of the striated muscles. Its location at the level of the elbow is rare. It occurs in young patients, often following trauma as it can also develop without experiencing any traumatic event. Its predominant location is at the level of the larger muscles limbs root (gluteus, deltoid) or of the areas which are most exposed to direct shocks (the quadriceps in more than 40% of post-traumatic cases). Our study aims to highlight the aspects of a circumscribed myositis ossificans in conventional radiology and tomodensitometry to avoid potential diagnostic confusion with a malignant bone tumor.

Supraspinatus Intramuscular Calcified Hematoma or Necrosis Associated with Tendon Tear

Introduction. Rotator cuff intramuscular calcification is a rare condition usually caused by heterotopic ossification and myositis ossificans. Case Presentation. We describe a patient with voluminous calcified mass entrapped in supraspinatus muscle associated with corresponding tendon tear. Histological examination corresponded to a calcified hematoma or necrosis. Patient was surgically managed with open excision of the calcified hematoma and rotator cuff arthroscopic repair. At 6 months, supraspinatus muscle was healed, and functional outcome was good. Discussion and Conclusion. We hypothesized that supraspinatus intramuscular calcified hematoma was responsible for mechanical stress on the tendon. This association has never been described.

Ossifying lesion of the rotator interval

We report a case of a 15-year-old girl who presented with pain and swelling in the right shoulder. Imaging studies showed an inflammatory process well limited at the rotator interval. Open biopsy showed an osteogenic process that was evident in the postoperative X-rays. Two-year follow-up showed a mature ossification at the rotator interval.