Co-existing abdominal aortic aneurysm and intra-abdominal malignancy: reflections on the order of treatment. 
The management of simultaneously occurring abdominal aortic aneurysm and intra-abdominal malignancy is controversial.  It is unclear whether to treat the aneurysm first or the malignancy, or both simultaneously.  If the malignancy is resected first there is a risk of postoperative rupture of the aneurysm.  If simultaneous surgery is performed there is a risk of prosthetic graft infection from contamination by gastrointestinal or urinary tract contents.  Relevant papers from 1960 to 1996, identified from Medline and manual searching, were reviewed.  The literature supports the conclusion that the lesion of greater priority is that posing the greater threat to the patient; this is usually the aneurysm, especially if it is over 6 cm in diameter.  For renal malignancies simultaneous surgery is the treatment of choice, but for bladder cancer the best management is unclear.  Large aneurysms should usually be resected in preference to colorectal cancer unless the cancer is locally advanced, perforated or likely to result in early intestinal obstruction.  If both lesions are complicated there may be a case for simultaneous treatment.