Fig. 2. Sequential images of the radionuclide salivagram throughout the 1 hour immediately following oral administration of the Tc-99m sulfur colloid solution. (A) The presence of a radiotracer in the trachea and bilateral bronchi is a positive indicator of salivary aspiration (arrows). (B) The uptake of the radiotracer noted only in the oropharynx, esophagus and stomach is a negative indicator of salivary aspiration.
