LIVING ART ENTERPRISES, LLC / SCIENCE PHOTO LIBRARY LIVING ART ENTERPRISES, LLC / SCIENCE PHOTO LIBRARY
This sagittal (lateral) CT reconstruction of the lumbar spine clearly shows a bony defect involving the L5 pars interarticularis. This is called a spondylolysis. This is often a traumatic defect that causes pain in the lower back, but can sometimes be related to a congenital weakness in the bone. There is no evidence of a subluxation (called spondylolisthesis).
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