Scoliosis of the crest is essentially a symptomatic description. That means that from the x-ray we find a scoliosis of the crest. The crest then has a scoliosis or a retrognathism, but the causes of this crestal scoliosis are diverse. For example: we can classify the crestal scoliosis into idiopathic crestal scoliosis, congenital crestal scoliosis, neurofibromatosis crestal scoliosis, and neuromuscular crestal scoliosis, etc. Idiopathic scoliosis is a type of scoliosis that develops in adolescence. These children may have a normal crest before the age of 10, that is, from adolescence to puberty, but after puberty, they begin to develop scoliosis. The cause of this scoliosis is not well understood, and it is considered that there may be a genetic relationship. The other most common type is congenital scoliosis. Congenital scoliosis refers to abnormal development of the vertebrae of the child at birth. For example, hemivertebral body or bone bridge formation, incomplete decomposition, these cause the abnormal development of the cribriform column. Because it is present at birth, it is called congenital scoliosis, and although it is hereditary, it is usually related to the environmental factors that influence the mother during pregnancy. There are other conditions such as neurofibromatosis. Scoliosis is caused by the presence of neurofibromatosis in the body. Or scoliosis can be caused by problems with the muscles and nerves, such as polio. Therefore, the causes of scoliosis are various and we need to analyze each case specifically.