Quadrigeminal plate lipoma

Q: What is the diagnosis? show answer

A: Quadrigeminal plate cistern lipoma.

Q: What are the tree most common locations for intracranial lipomas? show answer

A: Pericallosal, quadrigeminal plate cistern and suprasellar cistern.

Q: What is the main differential for a fat containing lesion in the brain? show answer

A: The main differential is that of a dermoid cyst, although it tends to have more heterogeneous signal and is usually located in the suprasellar region.

Q: In the pineal region (and elsewhere) what other lesion should be considered? show answer

A: Mature teratoma.

Q: True or false: Intracranial lipomas are incidental and not associated with any congenital malformations. show answer

A: True and false (sorry :) ). Although they are usually incidental and usually asymptomatic they are not infrequently associated with hypoplasia / dysplasia of the adjacent brain. This is most commonly seen in pericallosal lipomas which are associated with callosal dysgenesis.