List four indications for dynamic renal imaging.

1. Suspected renal obstruction (furosemide renogram)
2. Suspected renal artery stenosis with resul-tant hypertension (captopril renogram)
3. Suspected complications from renal transplantation (e.g., acute tubular necrosis, cyclosporine toxicity, rejection)
4. Suspected urine leak in the setting of renal transplantation or ureteral surgery