Fatty Liver, What causes this?

Hello I had a CT scan last month which revealed a fatty liver compared to spleen where the exact notes from the radiologists. He wrote no spots portal vein is fine no acute findings. I had a blood test which came back WBC normal RBC normal Glucose 74 BUN 7 Albumin 3.7 Bilirubin 0.5 AST 15 ALT 8 so everything came... show more Hello I had a CT scan last month which revealed a fatty liver compared to spleen where the exact notes from the radiologists. He wrote no spots portal vein is fine no acute findings. I had a blood test which came back WBC normal RBC normal Glucose 74 BUN 7 Albumin 3.7 Bilirubin 0.5 AST 15 ALT 8 so everything came back normal. How come my liver is fatty and these tests are normal. My gastroenterologist told me I wouldn't worry about it too much you are not over weight and your tests came back normal. But how can I not worry about it if the ct scan showed a fatty live. I am honestly freaking out I don't drink or do drugs or smoke, I do have PCOS which means I am insulin resistant but my glucose came back normal also not even prediabetic. :(
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