Retrorectal and omental tumors?

has anyone ever had a tumor that caused pain and pressure in both their pelvic area and rectum? I have 2 tumors as of today. I get intermitten pain in both of these areas and always together at the same time...biopsy was inconclusive and ct scan shows soft tissue mes.. and swollen lymph nodes or possibly tumor in the omentum. Are these usually benign or malignant tumors? What is the offical term for this condition