Effect of tin on the tissue distribution of /sup 99m/Tc--sodium pertechnetate

When tin complex is administered prior to the injection of /sup 99m/Tc-sodium pertechnetate, the distribution of the tracer is altered such that: the concentration at foci of cerebral pathology is drastically reduced; the concentration in the stomach (mucus cells), thyroid and salivary glands, and choroid plexus is greatly increased; and there is a shift of the tracer from the plasma to the red blood cells. Bone studies utilizing a tin complex should be done after other organs have been evaluated.