Periprosthetic sarcomas associated with total hip arthroplasty (THA) are exceedingly rare, and most reported cases represent undifferentiated pleomorphic sarcoma or osteosarcoma. Primary leiomyosarcoma of bone is also an uncommon malignancy, accounting for less than 1
The choice of treatment for chronic tendinopathy and related peritendinous conditions has become challenging as multiple options are available. When conservative treatments fail, injections of platelet-rich plasma (PRP), corticosteroids, and hyaluronic acid have become important in the management of these conditions. Other interventions, such as dry-needling, percutaneous tenotomy, percutaneous release, and hydrodissection, may also be used. Ultrasound guidance allows real-time visualization of the needle relative to its target and adjacent neurovascular structures. This is particularly advantageous for deep or small-caliber tendons, for procedures requiring precise intratendinous or peritendinous needle placement (e.g., PRP injection, hydrodissection), and for percutaneous release, where a blind approach carries a materially higher risk of neurovascular or tendon injury. This review summarizes the mechanism of action, technique, evidence, and indications for the injection treatments currently used for tendinopathy, and outlines the general principles of ultrasound-guided injection technique.
Capicua transcriptional repressor (CIC)-rearranged sarcoma is an aggressive and rare small round cell tumor predominantly affecting the soft tissues of extremities, often with early metastasis and poor prognosis. We report a case of a 46-year-old female presenting with a CIC-rearranged sarcoma of the right arm, notably complicated by extensive tumor thrombus involving the brachial, axillary, and subclavian veins, extending into the internal jugular vein, and regional lymphadenopathy. While tumor thrombus in CIC-rearranged sarcoma has been described in several abdominal cases, this is the first case described in the extremity, to the best of our knowledge. This case highlights the challenges in diagnosing this rare entity, the critical role of molecular confirmation, and the unusual presentation of widespread venous involvement, impacting staging and treatment considerations.
Acute injuries of the shoulder girdle commonly result from sports activities and lead to imaging studies. Radiologists who interpret these studies should be familiar with traumatic mechanisms and the imaging manifestations of glenohumeral dislocation, acromioclavicular sprain, rotator cuff tear, labral tear, osseous contusion or fracture, and myotendinous strain. Imaging findings are crucial for making accurate diagnoses, grading the severity of injuries, guiding treatment plans, and managing the athletes’ expectations for rehabilitation and return to sport. In this review article, we address common and uncommon injuries in both young and mature athletes. Focusing on magnetic resonance imaging, we provide examples of classic injuries and discuss pitfalls that challenge diagnostic interpretation.
