"Barium aspiration occurs occasionally during upper GI fluoroscopic studies using barium sulfate contrast, and usually only small amounts pass into the airways."
"When only tiny quantities of barium pass into the airways (so-called microaspiration) the patient may remain asymptomatic. The only evidence that it has occurred being visible passage of a small quantity of radiopaque barium into the larynx (laryngeal penetration) or trachea (tracheal aspiration) on the fluoroscopic image."
"When only tiny quantities of barium pass into the airways (so-called microaspiration) the patient may remain asymptomatic. The only evidence that it has occurred being visible passage of a small quantity of radiopaque barium into the larynx (laryngeal penetration) or trachea (tracheal aspiration) on the fluoroscopic image."
"Initial appearances on plain radiography, fluoroscopy and CT, will be similar with evidence of barium coating the larynx and tracheobronchial tree. Indeed it may bear a striking resemblance to an old-fashioned contrast bronchogram."