My aneurysm is also 1.3. Last summer I had a lot of pain in my right ribs up into my shoulder for several weeks. It passed after a while. I went to see my internist when I had the pain last summer. He is wonderful but he ordered the wrong kind of CT scan and it looked good. I should have gone to my Vascular surgeon. I went to my vascular surgeon for my annual check a couple of weeks ago and he is concerned that this the right side is pain connected to my liver. I had a splenic infarction in 2017 that was caused by a embolism from my celiac aneurysm. He is concerned that I may have had another small infarction to my liver. I am getting a CT scan in a couple of weeks then will meet with him again. I am hoping it is nothing. He noted that right sided pain can be your liver and should be taken very seriously for people who have a celiac aneurysm. For a small aneurysm he says you just watch it. But if I am having more clots that can affect other organs then we will have to consider surgery even though it is small. I can live without my spleen but not without my liver. I hope you see your vascular surgeon soon. Like I said, I should have gone to my Vascular surgeon last summer but on a positive note, I am dealing with it now. If you want I can keep you posted on what I find out.