A 74-year-old man was admitted with pneumococcal pneumonia and treated using antibiotics. The patient appeared delirious and restless after admission, necessitating physical restraint on occasion. On hospital day 5, chest X-ray (Figure 1) revealed an abnormal shadow suspected to represent a foreign body on the mediastinal side of the left lower lung field, resembling a denture. As no denture was found in the oral cavity and the patient was restless, unable to communicate with us or follow instructions, we suspected an esophageal or airway foreign body. Computed tomography (CT) of the chest (Figure 2) revealed a denture adhering to the dorsum of the patient. While CT is clearly useful for detecting and confirming the location of foreign bodies, the body surface should be checked carefully before imaging.