Thank you both for the feedback. After much discussion, speaking with our pediatrician and the advice of the neurologist, we have decided to wait on the MRI. We will see how her therapies go in the next 6 months. Since Lexi has not had any further regression and has actually shown some rapid improvement, all feel there is no rush to have this completed. Keep your fingers crossed for us, with any luck they will reverse her PDD diagnosis.
I do not know about MRI with sedation.That is a tough call at any age especially with a child with a disability. I just want to let you know that along with the EEG you might want to look at a her having an MEG here is a site that will tell you why both are important:
http://www.alexianbrothershealth.org/services/neurosciences/services/MEG-Brain-Mapping/index.aspx
I hope you get the answers you need,
achilles2