After having a CT scan with contrast for a post op mass, an unrelated 11cm cyst was found incidentally on my spleen. This finding has perplexed my primary physician and the hematologist that I was going to be referred to (I have an HMO). I am awaiting bloodwork to determine if the cyst is parasitic, but beyond that, I'm just told to take a wait and see approach if it's not parasitic. Does anyone have any experience with a splenic cyst? Isn't a mass that large on such a small organ dangerous?