a 55 YEAR old male smoker undergoes a physical examination and laboratory work up for a life insurance application.history and physical examination,including rectal examination are normal.blood count is also normal.but urinalysis reveals the presence of blood in urine(>20RBC/HPF).cystoscopy is negative.abdominal US reveals a 5cm solid mass in the upper pole of the left kidney,confirmed by CT scan.which one of the following is the most appropriate management?
1) CT scan guided percutaneous biopsy
2) retrograde pyelogram
3) repeat CT scan in 6 months
4) intravenous pyelogram
5) surgical resection