Unilateral physiological FDG uptake in teres minor muscle seems well associated with IV tracer injection procedures.

FDG uptake in teres minor (TM) muscle is often physiologically observed. Here we reviewed data of 578 consecutive patients; TM uptake was observed in 138 patients-in 2 of 68 patients who were administered with FDG via a preexisting line and in 136 of 510 after on-site puncture. In 126 patients with TM uptake without unsuccessful on-site puncture, 78% of TM uptake sites were on the ipsilateral side of injection, 8% on the contralateral side, and 14% on both sides; Cohen κ coefficient was 0.815 when confined to unilateral uptake. Therefore, TM uptake seems well associated with tracer injection procedures.