Colorectal cancer is the second leading cause of death from cancer in women in the United States. Previous epidemiologic studies have identified a 1.5 - 3 fold increased risk of colorectal cancer in women after ovarian and endometrial cancer. In Pakistan, neither such a study showing relationship of colorectal cancer with gynaecological cancer has been done nor any case has been reported. Here, a case is being reported who developed adenocarcinoma of rectum as the second primary about nine years after completion of treatment for adenocarcinoma of endometrium.