<s>[INST] I was just diagnosed with carcinoma in siu after a pterygium surgery.  I cant find much information and have not talked to my surgeon yet, he was not in.  Should I have any immediate worries, do they just monitor it or what is the standard treatment going forward [/INST] Hello dear, thanks for your question on Chat Doctor. I can understand your situation and problem. Carcinoma in situ is initial stage of cancer. This suggests that the cancer is limited to the tissue and not spread. So you are in stage 1 of the cancer. This carries good prognosis. Treatment is en block dissection of involved tissues. So better to consult oncosurgeon and discuss surgery.Don't worry, carcinoma in situ have great prognosis. </s>