Hypertrophic synovitis of the facet joint forming a para-articular mass in cases of herniated intervertebral disc.
D006801:Humans; D006984:Hypertrophy; D007405:Intervertebral Disc Displacement / Q000150:complications*; D013581:Synovial Cyst / Q000209:etiology*; D013585:Synovitis / Q000150:complications* / Q000473:pathology