Diuretic renography in hydronephrosis: renal tissue tracer transit predicts functional course and thereby need for surgery

Purpose The recognition of those hydronephrotic kidneys which require therapy to preserve renal function remains difficult. We retrospectively compared the ‘tissue tracer transit’ (TTT) of 99mTc-mercaptoacetyltriglycine (99mTc-MAG3) with ‘response to furosemide stimulation’ (RFS) and with ‘single kidney function < 40%’ (SKF < 40%) to predict functional course and thereby need for surgery.