14-year-old male with trisomy 16 and hypoplastic dislocated shoulder.IMAGE ACQUISITIONS: CT of both shoulders without contrast enhancement processed in transverse, sagittal, and coronal planes. Left shoulder: As seen on prior radiographs, there is a deformed, angulated scapula with a dysplastic, shallow, and retroverted glenoid. The articular surface of the glenoid is essentially parallel to the axis of the medial aspect of the scapular body. The humeral head articulates with the glenoid, but appears slightly anteriorly subluxed. The coracoid process extends directly anteriorly from the dysmorphic neck of the scapula, resulting in a coracohumeral interval of over 2cm As seen on radiographs, the acromion is elongated and courses anterosuperiorly in relation to the humeral head. There is a linear lucency that partially traverses the acromion and has adjacent sclerosis; we are uncertain if this is an additional developmental defect or a stress fracture. The distal end of the clavicle is located superior to the ossification center of the acromion process.Right shoulder: There is a similar abnormal morphology to the right shoulder with a shallow, dysplastic, and retroverted glenoid that articulates with the humeral head. There is a small bone fragment along the posterior lip of the glenoid that may be posttraumatic in etiology. As with the left shoulder, the coracoid extends directly anterior from the scapular neck. The distal clavicle lies superior to the ossification center of the acromion.The spine is incompletely visualized, however, there is levoscoliosis of the cervicothoracic spine. Please refer to spine MRI for further spine report.
Bilateral shoulder abnormalities as described above.