Plain x-rays (and even CT scans) cannot depict a prolapsed disk and can only identify bony abnormalities.
Usually, sciatica is caused by a prolapsed disk in the spine that presses on the sciatic nerve. Other causes that may put pressure on the sciatic nerve may include the following: ...
Primary pulmonary hypertension
Processus vaginalis
Progressive external ophthalmoplegia
Progressive multifocal leukoencephalopathy
Progressive septic granulomatosis
Prolapsed disk
PROM
Prostate cancer ...
Primary nocturnal enuresis
Primary pulmonary hypertension
Processus vaginalis
Progressive external ophthalmoplegia
Progressive multifocal leukoencephalopathy
Progressive septic granulomatosis
Prolapsed disk
Prostate cancer ...
the nucleus will push toward the outside of the annulus and cause the disk to bulge in the direction of the pressure. This condition most frequently occurs in the lumbar region and is also commonly called a herniated nucleus pulposus, prolapsed disk, ...
 See also: Stress, Injury, Injuries, Arthritis, Aging
  
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