Renal imaging in posteroanterior position (R = right kidney, L = left kidney). A. 99mTc-DTPA renal scintigraphy shows vascular bed over the left kidney without visualization of the parenchyma with practically afunctional renographic curve of the same kidney. B. 99mTc-MAG3 scintigraphy shows very pale left kidney becoming increasingly better visualized later. Renographic curve of the left lidney shows obstruction over the third phase of the renogram.