In Sep 2003 experienced a blackout for the 1st time @ age 30. It lasted for 1-2 min. The same day experienced 2 more blackouts with jerking motions, the last one in front of docs who saw it as a grand mal. Age and absence of epi in family indicated problems like tumor. CT showed enlarged cavum septi pellucidi. EEG did not reveal any cause for concern. 3 sets of MRIs done between Sep 2003 and Feb 2004. Except for the said cavum 2,7 x 1,6 x 1,7 cm (roughly 1 inch x 2/3 x 2/3 of an inch) no tumor was found. The MRIs indicated mild compression of the interventricular foramens but without signs of hydrocephalus. Docs are convinced that this enlarged cavum is not causing the blackouts. Subsequent EEG findings were mildly dis-rhythmically changed with suspicious lateralization left front-temporally with only indicated paroxysmal tendency exclusively on the provocation methods. I was put on anticonvulsants (Lamotriginum + later Valproic acid). Since the therapy had 4 additional blackouts without jerking that lasted around 10 secs. During blackouts would turn pale as a sheet. If I would end up lying would come round more quickly than if I would remain sitting. Docs described these blackouts as abortive grand mals. They did not examine other possible causes such as vasovagal disorders etc. Could it be that all of this is caused by the cavum septi pellucidi also referred to as cyst on some findings? Could it be that this cavum/cyst has been growing for the past 30 years and is now causing problems? Much obliged.would tur