Hi this is dr Subhadeep.thanks for the opportunity to help you.as per your description of the location of the place,it can t be gall stones.gall-bladder is to the right. it can be a renal stone but then you should have difficulty in passing urine or blood in urine.as u haven t mention any of these symptoms,I assume you don t have problems due to urinary stones.if u have some extra information you can provide.that will help me to deduce a diagnosis. regarding brown coloured stools it can be due to lower GI bleed which can be due to various reasons as enlisted 1) Angiodysplasia 2) ischemic colitis 3) mesenteric ischaemia 4)acute episode of ulcerative colitis 5)intussuception 6)Malignancy though colonoscopy done 10 yrs back was normal.there can be changes within the time period of 10 yrs.so a repeat colonoscopy is mandatory.i am interested to know whether you have any cardiac disease misty MI to give a clue for possible vascular insufficiency.why was colonoscopy done in the first case?is there family history of any cancer?kindly get a colonoscopy done and show it to your surgeon. angiography is better as it can detect a bleeding rate of 0.5ml/min.therapeutic emboli zayin can be done.ct angiogram,nuclear scintigraphy can detect 0.1ml/min bleed. as you had altered blood (brown stool) you can do an UGI scopy to rule out peptic ulcer. finally fecal occult blood test,platelet count if low then do serological test for dengue,widely and peripheral smear along with an USG to rule out any enlargement will be helpful. kindly let me know if you found this consultation helpful Regards