Figure 5.

Images of a 12-year-old boy. (a) Lateral radiograph with the head in flexion showing translatory dislocation. The C1 vertebra is dislocated anteriorly. (b) Lateral radiograph with the head in extension showing no reduction of the dislocation. (c) Sagittal computed tomography scan showing the atlantoaxial dislocation. (d) Three-dimensional computed tomography reconstruction revealing the translatory dislocation of C1 over C2. (e) Photograph of the boy holding his head with thumb over the chin to look ahead. (f) Postoperative computed tomography scan showing reduction of the dislocation