(a) Axial and (b) coronal MRI sections before calcitriol administration, demonstrating a huge mass infiltrating muscular compartments, extending to the thoracic inlet, obliterating the intervertebral foramina of the lower cervical and upper thoracic spine, and entering the spinal canal and circumscribing the right brachial plexus, the internal carotid artery and the subclavian artery and veins.