a postmenopausal 52 year old woman , 72 kilogram has got iron deficiency anemia ( Hb 10 and Ferritin of 1 ) , she took iron tablets for 6 months and her hemoglobin went up to 14.3 . one GI doctor told me that she should undergo colonoscopy to exclude a malignancy . She has no diabetes , no hypertension , she has Hashimoto's thyroididtis , no any symptoms of change in bowel habits , weight loss or noting blood per rectum . and I want to know what is your opinion , is there a possibility of a malignancy ? and what should be the next step ? Thanks in advance