We report on a 15-year-old boy in whom a spontaneous remission of a symptom
atic synovial cyst, possibly emanating from the L4-5 facet joint, was noted
. The medical history suggested that sport-related overactivity and/or mino
r trauma was the underlying cause. Conservative treatment for several month
s may be one treatment option if the cyst wall is not calcified and the sym
ptoms and signs related to radiculopathy show a gradual decrease.