PubMed · 1989 · 25 citations · 0 references
MedicineAnatomyCraniofacial DevelopmentCraniofacial GeneticsCraniofacial SurgeryCongenital Cranial AnomaliesCongenital Craniofacial AnomaliesCongenital Head AnomaliesCongenital Malformation PathologyCongenital MalformationsCraniofacial AnomaliesAtlanto-occipital Joint AnatomyBone Ossification CentersCervical Spinal Cord CompressionCongenital Spinal MalformationsCongenital Vertebral AnomaliesOccipital Bone AnatomyVertebral Canal AnatomyVertebral Congenital Anomalies
An unusual occipitoatlantoaxial malformation is described in a 2-week-old male part Arabian foal that was unable to stand at birth and showed signs of spastic tetraparesis due to a cervical spinal cord compression. There were 2 atlases present. One was fused to the occipital bones. The other articulated with the first atlas and an axis which had a long dens that projected into the vertebral canal. Examination of the ossification centers of the axis indicated partial duplication of that bone.