IS Case 299: Ventriculus terminalis
Imaging Sciences URMC 2009
Publication Date: 2009-08-05
Patient is a 12-month-old male with right leg weakness and sacral dimple on physical exam.
Ovoid cystic dilatation of the distal central spinal cord between the conus medullaris tip and filum terminale origin.
- Mild ovoid cystic (ependymal lined) dilatation of distal central spinal cord canal
- Represents point of union between the portion of the central canal may by neuralation and portion made by canalization of the caudal cell mass
- Usually disappears during 1st six months after birth
Location: between conus medullaris tip and filum terminale origin
- Size: 2-4mm transverse, usually
- < 2cm in length
Imaging Findings (macroanatomy):
- CECT: cord expansion, non-enhancing IM cavity between CMT and FTO
- MR: (between CMT and FTO; CSF intensity signal characteristics)
- T1W: hypointense IM cavity
- T2W: hyperintense IM cavity - T1+C: non-enhancing IM cavity
- Usually asymptomatic (likely to be identified in 2.6% of children without spinal disease)
Associated abnormalities: Occasionally identified with:
- caudal regression
- tethered cord
- Bowen B , Rivera A , Saraf-Lavi E. Spine Imaging: Case Review Series. 2nd ed., Mosby, 2008.
- Ross JS, Brant-Zawadski M, Moore K, et al. Diagnostic Imaging: Spine. Amirsys, 2004.