Filar Cyst

  • Etiology: Congenital
  • Imaging: Cyst in filum terminale
  • DDX:
  • Complications:
  • Treatment: No followup needed in asymptomatic neonates and infants
  • Clinical:
    — Common normal variant

Radiology Cases of Filar Cyst

US of filar cyst
Sagittal US of the spine (above) shows the conus medullaris to terminate normally at the L1-L2 level. A hypoechoic cystic structure is seen just inferior to the conus and is better seen on the zoomed image (below).