Took Lexi for her regular annual check and heartworm test. During examination the vet found a mass in her abdomen, 2.5 to 3 centimeters and round. You cannot see any lump. X-rays done today did not give any answers. Ultra sound tomorrow with possible aspiration. Has anyone had experience with this? Is there any questions I should ask the vet? She has no other symptoms. Eating, drinking, and eliminating is fine. She is only 5 years old.

thanks in advance for any advice.