Ancillary Finding on Myocardial Perfusion Imaging Due to Urinary Bladder Displacement.

When imaging patients are referred for single-photon emission computed tomography (SPECT) myocardial perfusion imaging (MPI) with technetium 99m (Tc) agents, the attention is focused on the tracer activity in the myocardium. Apart from myocardial activity, the normal biodistribution of Tc Sestamibi and Tc Tetrofosmin is seen in the thyroid, liver, gastrointestinal tract, kidneys, and urinary bladder. These structures may be visualized when a large field of view (FOV) gamma camera is used for SPECT imaging.