Lennox Gastaut Seizures Von Hippel - Lindau Disease And Lennox/Gastaut Syndrome.?

Von Hippel - Lindau disease and Lennox/Gastaut syndrome.? - lennox gastaut seizures

Has anyone heard of these two diseases, which coincide with others? Can it happen?

BVS by our family and cramps.

I do not know it leads to the other, but it is strange that these two rare diseases, which is a family.