Figure 1: This tectal plate lipoma demonstrates low density of fat on CT (top row left) and hyperintensity on T1WI (top row right). Fat-suppression techniques should make the lesion appear dark, as on this axial T2 fat-saturated sequence (bottom).
Figure 2: Axial (top row left) and sagittal (top row right) T1 images demonstrate an intrinsically T1 hyperintense pericallosal mass that is suppressed on T2 fat saturation imaging (bottom row). The appearance and location is classic for intracranial lipoma, resulting from a developmental failure of the meninx primitiva to involute.
- Fat-containing developmental or congenital abnormalities of neural crest origin
- Rarely neoplastic
- Arise secondary to abnormal differentiation of the meninx primitiva