In adults and older age group, Low back pain is exceedingly and eminently widespread and frequent and is the most familiar and repeated reason for seeking medical attention. Herniated lumbar disc accounts for majority of cases in them necessitating further refinement in management strategy. However unconstrained and spontaneous disappearance of large herniated lumbar disc has been reported very rarely in the literature till the time being. The authors report a distinctive and particular case of spontaneous regression of a large extruded lumbar disc in a 50 year old male. The patient presented with remarkably large lumbar extruded disc with backache and progressive neurological deficits and counseled for surgical discectomy but patient was lost on follow up. Later on the disc regressed spontaneously with improvement in clinical symptoms & evidenced by MRI scan done after 6 months. This paper has reviewed various literature & also discussed possible mechanism of disc regression with its impact on outcome. 

Keywords: Lumbar Disc Herniation; Spontaneous Regression; MRI, Foraminal Stenosis; Cauda Equina Syndrome.