A 37 day old baby was brought by his parents after they noted a depression over the lower back since birth
On sonography, in the midline, there is a well-defined longitudinally-oriented, elongated, anechoic, cyst-like structure caudal to the conus medullaris. Filamentous nerve roots reach upto it.
The MR oif the spine reveals spina bifida at the level of lower sacral vertebra. A cystic complex is noted in the spinal canal. The cauda equina roots are stretched and attached to this cyst.