Opisthion
Opisthion
Definition
Opisthion is the mid-point of the posterior margin of the foramen magnum. This specific point is an important craniometric landmark used in radiological measurements of the skull to identify conditions such as basilar invagination and atlanto-occipital dissociation.
References
Sardhara J, Behari S, Singh S, Srivastava AK, Chauhan G, Lal H, Das KK, Bhaisora KS, Mehrotra A, Mishra P, Jaiswal AK. A Universal Craniometric Index for Establishing the Diagnosis of Basilar Invagination. Neurospine. 2021 Mar;18(1):206-216. doi: 10.14245/ns.2040608.304.
