Findings

Pharyngeal residue

Also written as residue, post-swallow residue, vallecular residue, pyriform sinus residue, pooling, retention.

Pharyngeal residue is food or liquid left behind in the throat after a swallow, instead of everything clearing down the food pipe.

The pharynx is the part of your throat between the back of your mouth and the top of your food pipe. In a typical swallow, the muscles there squeeze in a quick wave and move almost everything through in about a second.

Pharyngeal residue means some food or liquid was still sitting in the throat after the swallow finished. Reports usually name where it was sitting. The valleculae are two small pockets between the back of the tongue and the epiglottis. The pyriform sinuses are two pockets lower down, on either side, just above the opening into the food pipe.

Residue can happen when the throat muscles do not squeeze as strongly as usual, or when the opening into the food pipe does not relax as fully as usual. A report may also describe roughly how much was left, whether a second swallow cleared it, and whether it looked different with different textures of food or drink.

Residue tells the clinician something about how completely the throat cleared a swallow, and where things got held up. It is one of the specific things a swallow study is designed to look at, alongside whether anything entered the airway, and it helps explain sensations like feeling that something is stuck in the throat.