What tests are needed after a CT scan?

I had a CT scan on Jan 26th 2006 that scan said I had 1 cyst on my L-ovary,1 on my kidney and 1 on my liver. I had a scan on Feb 17 that showed I now have 3 cysts on my R-ovary, I have 3 on my liver the size of nickels and several small(so many they can't count) on my kidney. My Dr.said PKD was suggested....
Why is there such a dramatic change in just a few weeks and is this normal?
What tests determine actual PKD results, and Should I see a specialist?