Sonographic characteristics of the cavum velum interpositum

Cheng Yu Chen, Fu Hwa Chen, Chueng Chen Lee, Kwo Whei Lee, Hai Sung Hsiao

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


BACKGROUND AND PURPOSE: Differential considerations for pineal region CSF collections include both true cysts and normal cystlike anatomic variations. Our purpose was to determine the sonographic characteristics of pineal region fluid spaces that reflect the presence of a normal persistent cavum velum interpositum (CVI). METHODS: Eighteen neonates and infants who had sonographic findings of 'cysts' in the pineal region were examined prospectively with conventional sonography and color Doppler sonography to evaluate the shape of the fluid collection and its anatomic relationship with the color-coded internal cerebral veins. Subsequent MR images were obtained in eight of these infants to determine the exact nature of the cystlike collections. RESULTS: The cystlike spaces in the pineal region were of an inverted helmet shape in 14 subjects and roundish in four. All were situated inferior or slightly anteroinferior to the splenium of the corpus callosum and 2.5 to 4 mm away from the quadrigeminal plate. The internal cerebral veins were either inferior (n = 12) or inferolateral (n = 6) to the cystlike spaces at sonography. Subsequent MR studies confirmed eight of these cystlike spaces to be the posterior portion of the CVI. CONCLUSION: The CVI may appear as a cyst in the pineal region on neonatal sonograms. Usually, it has a characteristic inverted helmet shape and is situated beneath the fornices and above the internal cerebral veins.

Original languageEnglish
Pages (from-to)1631-1635
Number of pages5
JournalAmerican Journal of Neuroradiology
Issue number9
Publication statusPublished - Oct 1998
Externally publishedYes

ASJC Scopus subject areas

  • Clinical Neurology
  • Radiology Nuclear Medicine and imaging


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