A CT (computed tomography) scan of the shoulder is a detailed imaging test that uses X-rays and computer processing to create cross-sectional images of the shoulder joint, including the bones, joint spaces, and surrounding soft tissues. 

 The CT scan provides high-resolution images that can be reconstructed in multiple planes (axial, coronal, sagittal) for precise evaluation. Contrast may be used in certain cases to assess soft tissue structures, though standard CT of the shoulder usually focuses on the bony anatomy.