Congenital lumbar spinal stenosis

Congenital lumbar spinal stenosis (CLSS) is a type of vertebral central canal stenosis and has a different epidemiology with less severe degenerative change compared to acquired/degenerative lumbar spinal stenosis

CLSS tends to affect patients at a younger age (30-50 years old) than lumbar spinal stenosis from degenerative or acquired changes. 

CLSS usually results from congenitally shortened pedicles. The aetiology is unknown but it is seen in achondroplasia 2

Central canal narrowing is the pertinent feature - various values have been proposed (AP mid-sagittal diameter <10-17 mm) but there is no consensus definition 2,3

Features of degenerative disc disease and facet joint arthropathy are often present but mild in severity. Unlike degenerative spinal stenosis, CLSS is distributed throughout the lumbar spine 2.

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Article information

rID: 35280
Section: Pathology
Tag: cases
Synonyms or Alternate Spellings:
  • Congenital lumbar spinal stenosis (CLSS)
  • Congenital stenosis of the lumbar spine

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