Posterior vertebral scalloping sign
 Etiologies of the Posterior vertebral scalloping sign
- Expanding masses: relatively large, slow-growing lesions that originate during a period of active skeletal growth and modeling (such as ependymomas of the terminal filum or medullary cone) are most likely to give rise to posterior vertebral scalloping. Other intraspinal masses such as dermoid cysts, epidermoid cysts, and lipomas also produce scalloping.
- On rare occasions, scalloping may be caused by intervertebral disk herniation.
- Diffuse scalloping in the absence of a mass has also been reported in cases of chronic raised intraspinal pressure due to communicating hydrocephalus.
- Dural ectasia is thought to cause posterior vertebral scalloping due to loss of the normal protection provided to the vertebral body by a strong, intact dura.
- Posterior vertebral scalloping is a consistent feature in achondroplasia.
- Mucopolysaccharidoses, including Morquio's syndrome and Hurler syndrome, are also associated with diffuse posterior vertebral scalloping.
 Imaging Findings for Posterior vertebral scalloping sign
- Posterior vertebral scalloping sign appears on a lateral radiograph of the spine as an exaggeration of the normal concavity of the posterior surface of one or more vertebral bodies.
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 References for Posterior vertebral scalloping sign
- Suzanne L. Wakely. The Posterior Vertebral Scalloping Sign. Radiology 2006 239: 607-609.