Partial aplasia of posterior arch of the atlas are
rare but well documented anomalies, most cases are asymptomatic
but cases of myelopaty and quadraparesis associated
to defects of posterior arch of the atlas have been published
in the past. Case 1: female, 31 years old, suffered traffic
accident with neck and upper limb pain. Partial aplasia of
posterior arch to the atlas was detected in X-Rays, at the
moment the patient continues with neck pain. Case 2: female
28 years old who referred neck pain after traffic accident,
partial aplasia of posterior arch of the atlas was detected.
Bibliographic review.

Partial aplasia of posterior arch of the atlas are
rare but well documented anomalies, most cases are asymptomatic
but cases of myelopaty and quadraparesis associated
to defects of posterior arch of the atlas have been published
in the past. Case 1: female, 31 years old, suffered traffic
accident with neck and upper limb pain. Partial aplasia of
posterior arch to the atlas was detected in X-Rays, at the
moment the patient continues with neck pain. Case 2: female
28 years old who referred neck pain after traffic accident,
partial aplasia of posterior arch of the atlas was detected.
Bibliographic review.