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We review the variations and anomalies of the neural arch and its processes as seen on MDCT images. Classic well-known radiographic features are briefly discussed and their MDCT counterparts are described. New MDCT signs that may help characterize complex anomalies are suggested.
Spondylolysis, commonly known as pars interarticularis defect or pars defect, is a defect in the pars interarticularis, the portion of the vertebral neural arch that connects the superior and inferior articular facets. It usually occurs in the lumbar spine.
The purpose of this pictorial essay is to review the variations and anomalies of the neural arch and its processes with a focus on the articular and transverse processes. We also discuss variations and anomalies of the neural arch at the high cervical spine.
The vertebral column is affected by a range of anatomical variants of the body and/or neural arch as well as accessory ossicles. Knowledge of basic vertebral anatomy and ossification is essential for describing and understanding the range of anomalies.
Congenital anomalies of the posterior arch of the atlas (C1) are relatively common anomalies. They may range from partial defects presenting as clefts to complete absence of the posterior arch (aplasia).
The S1 neural arch is incompletely fused in up to 58 % at age 8, 48 % at age 12, and 10–26 % of adults. A separation of 3 mm or less is normal and will often ossify during childhood. Occasionally, a similar narrow cleft may be encountered as an isolated finding at the T11 or T12 level.
W104. OBJECTIVE. The purpose of this pictorial essay is to review the anatomic variations and congenital anomalies of the neural arch and its processes as seen on MDCT images of the spine. CONCLUSION. Variations and anomalies of the pedicles, pars interarticularis, lami-nae, and spinous processes may be readily identified on MDCT studies.
Spondylolysis refers to an osseous defect within the posterior neural arch, most commonly within the pars interarticularis, an isthmus of bone located between the superior and inferior articular processes.
Spinal dysraphism, or neural tube defect (NTD), is a broad term encompassing a heterogeneous group of congenital spinal anomalies that result from defective closure of the neural tube early in...
Neural compression or instability is uncommon with these anomalies, only in rare instances is surgical intervention appropriate 10). We report three cases of posterior arch defects (two cases of congenitally absent cervical pedicles and one case of cervical spodylolysis) and describe the presentation, diagnosis, and treatment of these patients.