A new Peruvian case of malabsorption associated, with primary diffuse lymphoma of the small bowel and mesenteric lymph glands is reported. Without alpha chains either in blood or in urine. As in most of the 8 previous cases, medium oral doses of oxytetracycline suppressed diarrhea, markedly attenuated steatorrhea, restored the sense of well-being to the patient, and significantly increased his body weight. The terms 'Mediterranean lymphoma' and 'primary upper small intestinal lymphoma' ('PUSIL') have been inappropriately assigned to the condition.