[The gallstone ileus: key points and traps of diagnosis with sliced pictures].

Twenty-five per cent of obstructions in patients 70 years and over could be caused by gallstone ileus. Due to the variable clinical symptomatology, diagnosis can be delayed and results in poorer outcome than expected for this benign pathology. Early CT evaluation improves the accuracy of diagnosis. Based on a review of twelve cases, the typical imaging features and pitfalls will be reviewed.