My son has been to the ER 2x in the last month with extreme back right side and abdomen pain and severe vomiting. The first time the symptoms faded and they sent us home with no real testing (urine only) taking a wait and see approach. This time they did blood work which showed slightly elevated white count and a CT which showed mesenteric lymph**** ? and they could not rule out lymphoma. They called us late Saturday evening to tell us the results. What are they referring to? I am going to try and get him into the drs tomorrow.