Extensive cervicothoracic posterior arch defects from C1 to T6 leading to myelopathy due to thoracic kyphosis in an adolescent boy.

We present a rare congenital cervical dystrophic anomaly causing myelopathy secondary to progressive kyphosis. We speculate that this anomaly was due to the sclerotomal cells' failure to migrate dorsally to the neural tube and fuse in the midline.