Which condition involves the involuntary expulsion of contents?

The condition involving the involuntary expulsion of contents is aspiration. This occurs when individuals unintentionally breathe in substances such as food, liquid, or vomit into their lungs instead of swallowing them down the esophagus. Aspiration can lead to serious complications, including aspiration pneumonia, which is an infection that occurs in the lungs due to inhaled material.

In contrast, edema refers to swelling caused by excess fluid trapped in the body's tissues, and it does not involve expulsion. Fecal impaction is a condition where stool becomes hard and lodged in the colon, leading to difficulty in bowel movements but not an involuntary expulsion of contents. Dysphagia is characterized by difficulty swallowing but does not necessarily imply an involuntary expulsion of materials. Each of these other conditions has distinct characteristics and effects that differentiate them from aspiration.