Quiste gigante acromioclavicular en paciente mayor. Hasta cuando tratar la causa.

Introduction: Acromioclavicular joint cysts are a rare entity, generally present in elderly patients with chronic injuries or arthropathies of the rotator cuff. There are several causes of cyst formation, there are generally two of the most frequent, which we will talk about in this article. Clinical case: We present the case of an 82-year-old male patient with a giant acromioclavicular cyst, more than 20 cm in diameter, with rapid growth in recent months and with associated rotator cuff tendon injury. Discussion: These cysts are not very frequent injuries, mainly caused by degeneration of the acromioclavicular joint, most of the cases associated with rotator cuff injuries. Diagnosis is based on clinical examination, ultrasound and magnetic resonance imaging. Treatment by cyst aspiration and corticosteroid infiltration is not usually very effective and has a high recurrence rate, so surgical removal of the cyst is more indicated. Conclusions: The surgical indication for these cysts is pain, sometimes associated with resection of distal fragments of the clavicle; when a rotator cuff injury is present, reverse shoulder arthroplasty can be an alternative; however, in patients with poor symptoms, simple excision of the cyst can be an effective treatment.