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Introduction Sudden thrombosis of an abdominal aortic aneurysm is a rare condition with a high mortality rate. Report We present a patient with acute neurological deficits in both legs based on a thrombosis of a nine centimetre infrarenal abdominal aortic aneurysm. Successful iliac thrombectomy with aortic tube graft reconstruction was performed. Discussion Sudden thrombosis of an abdominal aortic aneurysm is a rare condition, but should be taken into consideration in patients with acute neurological deficits of the lower extremities. Prompt diagnosis and surgical management can lead to a successful outcome. A review of the literature is presented.

PP064-SUN EFFECTS OF NUTRITIONAL INTERVENTION ON IMMUNE MARKERS IN MALNOURISHED ELDERLY F. Neelemaat1, M.A. van Bokhorst-de van der Schueren1, H.J. Bontkes2, J.C. Seidell3, S. Hougee4, A. Thijs5. 1Nutrition and Dietetics/Internal Medicine, 2Pathology, Unit Medical Immunology, VU University Medical Center, 3Health Sciences, Faculty of Earth and Life Sciences, VU University, Amsterdam, 4Nutricia Advanced Medical Nutrition, Danone Research, Centre for Specialised Nutrition, Wageningen, 5Internal Medicine, VU University Medical Center, Amsterdam, Netherlands

Gastro-intestinal stromal tumour (GIST) is increasingly recognized as a distinct entity within the group of soft tissue tumours. Mostly, GIST arises from the muscular components of the stromal layer, but the tumour may also originate from the autonomic nerve system, recently designated as gastro-intestinal autonomic nerve tumour (GANT). The majority of GIST is located in the stomach and small intestine; only 4% of GIST is found in the duodenum. Clinical and pathological criteria to differentiate benign from malignant GIST are not well established. Tumour size and mitotic activity are commonly considered as important features, predicting biological behaviour and outcome. It has been suggested that the clinical course of the GANT-type tumours may be more aggressive. We present a case of a radically resected duodenal stromal tumour with benign features, in a young woman, with metastases to the liver and peritoneum occurring 8 years after the initial diagnosis.