label: Cervical C2/C3 vertebral fusion
label_lc: cervical c2/c3 vertebral fusion
description: Fusion of cervical vertebrae at C2 and C3, caused by a failure in the normal segmentation or division of the cervical vertebrae during the early weeks of fetal development, leading to a short neck with a low hairline at the back of the head, and restricted mobility of the upper spine.