Congenital Hypoplasia of Posterior Arch of Atlas: A Case Report

Abstract

Congenital defects of the posterior arch of the atlas ranging from simple clefts to partial or total aplasia are quite rare with incidence varying from 0.69% to 4%. Most of them are asymptomatic and detected incidentally. However, a complete workup with advanced radiological imaging is necessary to identify the extent of the malformation and any associated anomalies for proper patient counselling to prevent any future neurological complications. Here we discuss a rare form of congenital defect in posterior arch of atlas along with its clinical significance and a brief review of literature.

Keywords

• atlanto-axial instability
• currarino’s classification
• posterior tubercle