My cat had surgery 6 months ago (to remove yarn) and the vet said the tail of his spleen is kind of curled under and there is a large fat deposit around it. Indeed, Dylan is a fairly sleek cat, except for his flabby lower belly pouch. The vet said it was odd, but probably not a problem, but I wonder... is this something I should be concerned about? An indicator of a more serious health problem? He is only 2 years old and otherwise in great health.