Hansen type I and II disc herniations

Multiple intervertebral disc herniations corresponding to the lumbar vertebrae. The herniations on the second, third and fifth discs from the left are Hansen type I (dorsal limit of the fibrous ring ruptures and the nucleus pulposus protrudes in the pavement of the rachidian canal), while the herniations on the first and fourth disc are Hansen type II (the intervertebral disc is dorsally deformed but the fibrous ring doesn’t rupture). The disc on the right of the image is normal. The right-side image corresponds to an enlarged image of the first three discs. Below, Hansen type I (middle) and type II (left) herniations can be clearly seen, in contrast with the normal intervertebral disc on the right.