x-ray of cervical spine: bony ankylosis of posterior elements at C1-C2 level
x-ray of cervical spine: bony ankylosis of posterior elements at c1-c2 level
x-ray of cervical spine: bony ankylosis of posterior elements at C1-C2 level
x-ray of cervical spine: bony ankylosis of posterior elements at c1-c2 level