Summary of osseous anomalies and clinical presentation of 12 patients with occipitalization of the atlas.
| Case No. | Age (yrs), Sex | Comorbidity | Fusion Type | Hypoplastic Occipital Condyle | Atlantoaxial Joint | Vertebral Fusion | Clinical Presentation | |
|---|---|---|---|---|---|---|---|---|
| Medial | Lateral | |||||||
| 1 | 51, F | partial | subluxated (mobile) | hyperreflexia, paresthesia (extremities), pain in the nape of the neck | ||||
| 2 | 47, F | complete | rt | subluxated (irreducible) | deformed | C2-3 | hyperreflexia, paresthesia (occiput, extremities), motorweakness, gait disturbance | |
| 3 | 63, M | partial | subluxated (irreducible) | C5-6 | hyperreflexia, paresthesia (extremities), pain in the nape of the neck | |||
| 4 | 56, M | complete | subluxated (mobile) | C2-3 | hyperreflexia, paresthesia (extremities), gait disturbance | |||
| 5 | 63, F | complete | lt | subluxated (irreducible) | C2-3 | hyperreflexia, paresthesia (occiput, extremities), gait disturbance | ||
| 6 | 68, F | complete | subluxated (irreducible) | deformed | C2-3 | hyperreflexia, paresthesia (extremities), gait disturbance | ||
| 7 | 74, M | Chiari malformation | partial | lt | hyperreflexia, paresthesia (extremities), gait disturbance | |||
| 8 | 46, M | complete | lt | subluxated (irreducible) | C2-3 | hyperreflexia, paresthesia (extremities), gait disturbance | ||
| 9 | 77, F | complete | subluxated (irreducible) | C2-3 | hyperreflexia, paresthesia (extremities), gait disturbance | |||
| 10 | 66, F | partial | rt | subluxated (irreducible) | hyperreflexia, paresthesia (extremities), gait disturbance | |||
| 11 | 62, F | RA | complete | hyperreflexia, paresthesia (occiput, extremities), motorweakness, gait disturbance | ||||
| 12 | 45, F | OPLL | complete | hyperreflexia, paresthesia (extremities), motorweakness, gait disturbance | ||||