I noticed my younger brother who received chemo to treat a sarcoma developed a dark ring around the outside of his blue iris. Then, after I myself had surgery to remove a papillary tumor had dark rings develop around the rim of my own lighter brown/hazel iris. Can you tell me what causes this?
Just found picture of Kayser-Fleischer Ring here: http://www.milesresearch.com/main/eyesigns.asp#kayser-fleischerring
And, that sure looks exactly like what's going on. Also, the explanation is intriguing because it mentions "prolonged cholestasis" as a possible cause and we've both had gall stones in the CBD! So, I've printed that out to take to my gastro...
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