Cavum Velum Interpositum

  • Etiology: anatomic variation
  • Imaging: CSF space between the atria/trigones of the lateral ventricles, behind the foramen of Monro, beneath the columns of the fornices and above the tela choroidea of the 3rd ventricle

Radiology Cases of Cavum Velum Interpositum

MRI of cavum vellum interpositum
Sagittal (left) and axial (right) T1 MRI without contrast of the brain show a cystic structure between the atria/trigones of the lateral ventricles, behind the foramen of Monro, beneath the columns of the fornices and above the tela choroidea of the 3rd ventricle.