Progressive non-infectious anterior vertebral fusion (PAVF) is an early childhood spinal disorder with characteristics of the gradual onset of thoracic and/or lumbar spine ankylosis often in conjunction with kyphosis with distinctive radiological features. Prevalence is unknown, but PAVF (mostly isolated cases) has been reported in approximately 80-100 cases. Neurological abnormalities are exceptional. PAVF can occur isolated or less frequently, as part of a syndrome. Syndrome associated manifestations include facial dysmorphism, absence of one cervical vertebrae, radio-ulnar synostosis, exostosis.