Lipoma

Lipoma
Intracranial lipomas are thought to be brain malformations rather than a true neoplasm. Half of these occur with various degrees of callosal dysgenesis. About 80 to 90 per cent of lipomas are seen in the midline. Lipomas may be callosal or cisternal (Figure ). Callosal lipomas may be anterior bulky tubulonodular which are usually associated with callosal dysgenesis, or they may be posterior ribbonlike curvilinear, which are seen with normal corpus callosum 1]. Lipomas have typical fat density (-50 to -100 Hounsefield Units) on CT. On MRI, lipoma appears hyperintense on T1 weighted image, intermediate signal on T2 weighted image and suppressed on fat-suppressed image.
Figure : Sagittal T1 weighted MR image. A lipoma which is very bright on T1 weighted image, is seen along superior border of cerebellar vermis (Arrowhead).

Reference:The Internet Journal of Radiology™ ISSN: 1528-8404