Expected headings
"Gross anatomy"
"Development"
"The prebasioccipital arch is a very rare variant; one study reported a prevalence of 0.025% 2."
"The prebasioccipital arch is a rare incidental finding. If it articulates with the atlas (C1) or axis (C2), it may theoretically disturb the occipitocervical articulation and cause neck pain and dysfunction; however, symptomatic cases are not well described, so its true clinical significance remains uncertain 3. The prebasioccipital arch is not seen to encroach posteriorly on the foramen magnum, so resulting neural compression is considered unlikely 4."