A Pediatric Radiology Textbook and Pediatric Radiology Digital Library
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
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).