A picture of pelvis
It is an x ray picture with dye of the pelvis of the kidneys, either from above or below.
From above, dye is infused IV and filtered into kidneys (iv pyelogram) then goes to pelvis of kidneys which is the funnel connection bet a kidney and a ureter. From below means a urologist injects a dye upwards the ureter using a scope then takes the picture (ascending pyelogram). It shows stones or tumors.