DORSAL MESENCEPHALIC LIPOMA WITH INFERIOR COLLICULAR HYPOPLASIA - A CASE-REPORT AND REVIEW OF LITERATURE

Intracranial lipomas are rare lesions the pathogenesis of which is sti ll a matter of debate. We report the case of a patient presenting an a symptomatic lipoma located in the quadrigeminal and supra-cerebellar c isterns. The lipoma was associated with hypoplasia of the right inferi or colliculus and of the rostral part of the vermis. Analysis of the r elationships between neural tube and meninges prompts us to propose th at the primary event of this malformation is a defect of the neural an lage which gives rise to both nervous dysplasia and lack of meningeal induction responsible for lipoma development. (C) 1997 Elsevier Scienc e B.V.