Cervical spondylolysis is defined as a corticated cleft between the superior and inferior articular facets of the articular pillar, which is the cervical equivalent of pars interarticularis in the lumbar spine. It is very important to avoid confusion with more clinically significant abnormalities, such as fracture or dislocation. This case report describes bilateral spondylolysis and associated dysplasia of C6. We describe the radiographic presentation of this anomaly, stressing the importance of computed tomography and magnetic resonance imaging for a correct diagnosis. A review of the literature on this interesting abnormality and a complete differential diagnosis are presented.