Three presentations were given regarding tin-117m at SNMMI in San Diego today.  The presentations are “A Comparison of Er-169 and Sn-117m Radiation Synoviorthesis Using Monte Carlo Simulation,” presented by Richard Wendt, PhD, “Retention and Biodistribution of Sn-117m Colloid in Intra-Articular Injections,” presented by Nigel Stevenson, PhD, and “Validation of the Use of Homogeneous Sn-117m Colloid Radiosynoviorthesis in a GLP Osteoarthritis Rat Model,” presented by Cynthia Doerr, MD.