Rhombencephalosynapsis diagnosed in childhood: clinical and MRI findings.

Rhombencephalosynapsis is an unfrequent malformation of the posterior fossa essentially characterized by vermian agenesis or hypogenesis, fusion of the cerebellar hemispheres and fusion of the dentate nuclei. Supratentorial abnormalities are usually associated. No specific clinical syndrome can be described in relation with this disorder. We report a case diagnosed by MRI in a living patient.