i was checking the conlusion reports of older scans for ch.i read somewhere inbetween that there is a variant(not sure if this is the proper word translated)
of dandy walker syndrome.
Obviously i assume it has no significant value as many docs have read it and noone said anything about it.
but still i wonder if there is something similar with your own reports from mri,cat scans??  :-/

Because dandy walker syndrome interferes with the normal function of the brain, it might be that people with that condition are somewhat more likely to have cluster headaches (and migraine, depression, epilepsy, and a few dozen other neurological conditions). 

Dandy Walker is much rarer than cluster headaches (1 in 25,000 for DW, 1 in 1,000 for CH). Also, DW is usually seen in females.  There might be a link for some individuals, but for most people with clusters, there is no relation between the 2 conditions. 

thanks monty.