Did the doctor ordering the test review the scan with you, explain in laymen's term, and say what is the next course of action is? Like all, I'm not familiar with this, and looked at the diagnosis on the mentioned CT report, DG1: Polytop Lytic Infiltration of Pelvic Bone, and wished I knew more about it.
Good luck with everything, I hope you find answers soon, and as mentioned, you can get a 2nd opinion, if you can.