A patient underwent insertion of urinary catheter right before surgery for monitoring diuresis during operation. However, diuresis was minimal during surgery. Moreover, haematuria (without the formation of coagula) appeared.
Is the catheter inserted properly? Is a urinary bladder empty or full of coagula? Is the whole amount of urine evacuated via a catheter, or is there any obstruction present? All of these questions may be answered thanks to ultrasonographic examination: