EDITORIAL SYNOPSIS There appears to be an increased incidence of carcinoma of the fore and mid gut in patients with villous atrophy of the small intestine.Intestinal reticulosis may arise as a complication of idiopathic steatorrhoea (Gough, Read, and Naish, 1962). Creamer (1964) has suggested that malignancy anywhere in the body may be accompanied by villous atrophy of the small intestinal mucosa. In this paper, seven patients with steatorrhoea and accompanying carcinoma are presented and the possible reasons for this association are discussed.CASE REPORTS CASE 1 A man aged 50 years was in good health until April 1961, when he complained of pain in the right buttock and was treated with phenylbutazone. He afterwards developed watery diarrhoea, passing six to 10 motions daily, which lasted a fortnight. Subsequently his bowels opened four times a day and the stools weie clay coloured and offensive. His appetite was good. Apart from pallor, physical examination was normal.Investigations showed that haemoglobin was 47 % with evidence of iron deficiency. A small intestinal barium meal showed the features of steatorrhoea. Faecal fat was 90 g. in three days. Xylose absorption was normal. A glucose tolerance test (50 g.) produced a rise of 40 mg./100 ml. The patient refused to have a jejunal biopsy.He was followed up in the Out-patient Department and the iron-deficiency anaemia was treated with oral and parenteral iron. When a gluten-free diet was prescribed his weight increased by 8 lb. and a subsequent three-day faecal fat estimation was 26 g. As anaemia persisted in spite of treatment, he was admitted for transfusion during the summer of 1962. A 51Cr-labelled red cell study was carried out and showed an average daily blood loss of 39 4 ml. Faecal fat was 23-9 g. in three days.In December 1962 he was admitted as an emergency because of upper abdominal pain, and after a blood transfusion a laparotomy was carried out, at which an ulcerated annular tumour was found 10 cm. below the duodeno-jejunal flexure. The tumour and 15 cm. of jejunum were resected. Histological examination showed the tumour to be an adenocarcinoma with no lymph node metastases. The jejunum showed partial villous atrophy.He has been in good health since the operation with bowels opening once a day. Haemoglobin has risen to 97%.CASE 2 A man, aged 70 years at the time of death, had had attacks of diarrhoea and lower abdominal pain since 1946. Idiopathic steatorrhoea and megaloblastic anaemia were diagnosed in 1954. He was treated with a gluten-free diet and improved. He was admitted again in 1960 because of diarrhoea and weight loss. On examination he was small, wasted, and pale. Clubbing was present as were abdominal distension and dorsal kyphosis.Investigations revealed 36 g. of fat in a 24-hour stool collection and only 1-7 g. of 25 g. of d-xylose was excreted in the urine in five hours. A glucose tolerance test revealed a maximum rise of 10 mg./100 ml. A jejunal biopsy showed subtotal villous atrophy. Serum albumin was 2-2 g./100 ml. and serum y gl...