Radiology Teaching Files > Case 7168214

Contributed by: Fritsch & Thompson, Radiologist, Diagnostic Radiology of Houston, Texas, USA.
Patient: male

Fig. 1

Fig. 2

Fig. 3

Fig. 4
Findings: Radiolucent defect in articular pillar of L5 and miminal anterolisthesis.   Spina bifida occulta L5.
Discussion: There is an increased incidence of  L5 spondylolysis when spina bifida is present, leading to the erroneous conclusion that the separation in the pars interarticularis is also a "congenital defect".  While some congenital predisposition to spondylolysis may occur due to inherited morphological characteristics of the posterior elements, the overwhelming majority of pars separations are acquired as stress fractures during childhood and adolescence.  Autopsy studies of newborns have failed to show congenital lumbar spondylolysis.
No comments posted.
Additional Details:

Case Number: 7168214Last Updated: 11-17-2006
Anatomy: Skeletal System   Pathology: Trauma
Modality: Conventional RadiographAccess Level: Readable by all users
Keywords: spondylolysis; spondylolisthesis; spina bifida

The reader is fully responsible for confirming the accuracy of this content.
Text and images may be copyrighted by the case author or institution.
You can help keep MyPACS tidy: if you notice a case which is not useful (e.g. a test case) or inaccurate, please contact us.