Vertebral scalloping

http://radiopaedia.org/articles/vertebral_scalloping

Posterior scalloping

Causes of posterior scalloping include:

achondroplasiaan intraspinal masses, such asspinal astrocytomaependymomaspinal schwannomamyxopapillary ependymomaspinal paragangliomaneurofibroma as seen in neurofibromatosis type 1dural ectasia as seen inneurofibromatosis type 1a hereditary connective tissue disorder such as Marfan diseaseEhlers-Danlos diseaseosteogenesis imperfecta tardamucopolysaccharidosesacromegaly

Anterior scalloping

Causes of increased anterior scalloping include:

retroperitoneal lymphadenopathychronic leukaemia and lymphomatuberculosismany othersabdominal aortic aneurysmDown syndrome