In our case, drug-induced localized extensor myositis of the cervical muscles was suspected because of the increased luminosity of the cervical extensor muscle on echographic examination; the finding of active denervation, especially myositis, confined to the cervical paraspinal muscle on electromyography; and the negative results of anti-SRP and anti-HMGCR antibody tests. This evidence concerns the gene HMGCR and myositis disease.