Filar Cyst

  • Etiology: congenital
  • Imaging: cyst in filum terminale
  • Clinical: common normal variant, no followup needed in asymptomatic neonates / infants

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).