- To demonstrate the contribution of modern imaging in the diagnosis and management of bony malformations of the cranio-cervical junction. - Illustrate the different bony malformations of the crânio-cervical junction.

Bone malformations of the cervico-occipital junction (MCOJ) are constitutional abnormalities of the cranio-rachidian junction grouping, on the one hand, the major bone malformations and on the other hand minor malformations. They are secondary to embryological disorders, some of which fall within the framework of chromosomal abnormalities or observed in the context of genetic syndromes. They are diverse and often associated with each other. It is a benign, congenital, disabling, slowly progressive and sometimes brutal decompensation. Its clinical and radiological expression is very polymorphic, explained by...

The scanner allows precise and meticulous study of the bone structures and a great ease of interpretation thanks to the multiplanar cuts. Indeed, the scanner offers the possibility of multiple oblique views, in any plane, which facilitates the understanding of complex structures. The advantage of CT is also in its sensitivity and specificity in the detection of minor bone malformations which remains superior to MRI, 100% in most series [3]. The CT also allows a satisfactory analysis of the bone relations with medullar strucures in...

CT and MRI examinations that both complement helped provide a comprehensive radiological assessment and careful study of all the associated lesions that make the complexity of malformation of cranio-cervical junction and determining treatment decisions.

Chamberlain WE. Basilar impression (Platybasia). Yale J Biol Med. 1939;11(5):487–96. McGregor M. The significance of certain measurements of the skull in the diagnosis of basilar impression. Br J Radiol. 1948;21(2):171–81. Duffau H, Sahel M, Sichez JP, Marro B. Three-dimensional computerized tomography in the presurgical evaluation of Chiari malformations. Acta Neurochir (Wien). 1998;140(5):429–36. Adamsbaum C, Merzoug V, Hamidou A, Dubousset J, Khalifa G. Malformations congénitales du rachis. Encycl Med Chir (Elsevier Masson, Paris), Radiodiagnostic-Squelette normal-Neuroradiologie-Appareil locomoteur, 331120-A-10, 2001, 10p. Pinter NK, McVige J, Mechtler L. Basilar...