A full term infant with a simple sacral dimple and unremarkable neurological exam.
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Fusiform simple cyst (blue arrow) measuring 8 x 3mm located just caudal to the termination of a normal conus medullaris (red arrow).
A filar cyst is located in the filum terminale of the spinal cord and is considered a normal variant. It is not in the spectrum of spinal dysraphism. Filar cysts should not be confused for persistent terminal ventricles which are present in the conus medullaris.
This case was submitted with supervision and input from:
Soni C. Chawla, M.D.
Department of Radiological Sciences
David Geffen School of Medicine at UCLA
Olive View - UCLA Medical Center
- Rossi A, Biancheri R, Cama A et al (2004). Imaging in spine and spinal cord malformations. Eur J Radiol 50: 177-200.
- Irani N, Goud AR, Lowe LH (2006). Isolated filar cyst on lumbar spine sonography in infants: a case control study. Pediatr Radiol 36: 1283-1288.
- Jha P & Chawla SC (2009). Pediatr Radiol. 39: 414. doi:10.1007/s00247-008-1089-1