RODRIGUEZ BELLANCO, J; ALVAREZ ALVAREZ, R; TORRE MOLLINEDO, F    GIL TENJIDO, S. Motor block after caudal epidural infiltration: a case report. []. , 26, 2, pp.120-123.   23--2020. ISSN 1134-8046.  https://dx.doi.org/10.20986/resed.2018.3669/2018.

Chronic back pain is an illness with a prevalence that goes from 54 to 80 per-cent in our population. It has a significant occupational and social health impact.

The Origen is very varied and obeys to multiple causes. Only 10 percent turns chronic, but consumes Heath resources than can reach up to 80 percent. To consider are the perineural cysts or Tarlov cysts. They are alterations of the duramater of the nerve roots.

The diagnosis is usually casual by magnetic resonance. The incidence is variable, because the finding is incidental. The are usually asymptotic, but can cause radiculopathy, perineural pain or neurogenic bladder.

: Motor block; caudal infiltration; Tarlov cist; chronic back pain.

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