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MRI scan

i had an mri  scan and was told i had a right A1 segment hypoplastic. what does this mean please?
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I just received my report back on my CTA from my neurologist and he said that everything was normal on the report. The report states that I have mild hypoplasia of the right A1 segment. I went to a neurologist due to the fact that I have been having dizziness for short periods of time. I had been in the ER 2 times in one month because with this I experienced some tingling in my left side.  I am a 67 year old female looking for answers as I do not know where to go from here.
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1340994 tn?1374193977
hypoplasia - definition of hypoplasia in the Medical dictionary ...
medical-dictionary.thefreedictionary.com/hypoplasia - Cachedhypoplasia /hy·po·pla·sia/ (-pla´zhah) incomplete development or underdevelopment of an organ or tissue.

Hypoplasia of the A1 segment is a congenital condition, so you would have been born with it.

Absence or hypoplasia of A1 segment of anterior cerebral artery occurs approximately in 2% of general population. It is a conjenital vascular variant that usually does not cause any symptoms of vascular insufficiency. This finding is most often incidental, but it increases the chance of developing an ACOM artery aneurysm.  So it sounds like it is good to know you have this variant so they can monitor it.  
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