Urinary tract obstruction is relatively seldom responsible for causing acute renal failure. It is also known that the iatrogenic factors account for very small percent of all episodes of obstructive renal failure. This report concerns a patient with acute renal failure due to improper urinary catheter use. It was followed by inattentive and nonchalant examinations taken by urologist in spite of the evident symptoms of acute obstructive renal insufficiency. The authors emphasize the importance of properly taken patient's history and physical examination to prevent patients from fatal courses of diseases. It is also sufficient to avoid difficult ethical problems and to protect ourselves from unpleasant legal consequences.