Unchewed Medication Tablets Mimic Foreign Objects on X-Rays
Doctors report that lanthanum carbonate tablets can appear as metallic foreign bodies in medical imaging when not chewed properly.
Updated on Oct. 30, 2026 in Healthcare
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Medical cases published in February 2026 highlight how unchewed lanthanum carbonate tablets appear as radio-opaque foreign objects on X-rays. Because the drug contains an element with a high atomic number, it strongly absorbs X-rays, often mimicking the appearance of metallic items or coins in the digestive tract.
Why it matters
Radiologists and clinicians must be aware of this phenomenon to prevent misdiagnosis and avoid unnecessary or invasive endoscopic procedures. Misidentifying the medication as a foreign object can lead to complications such as emergency hospitalizations or invasive diagnostic steps that are ultimately unwarranted.
The 18-millimeter chewable lanthanum carbonate tablets possess a density of 3,071 Hounsfield units. These tablets, designed for phosphate control in kidney failure patients, are composed of lanthanum, an element with an atomic number of 57.
The players
Chakri Naruebodindra Medical Institute
This is the medical facility in Thailand where the 60-year-old patient was treated for COVID-19 pneumonia.
Food and Drug Administration
This is the United States federal agency responsible for approving drugs and issuing safety labels regarding gastrointestinal risks.
The details
Lanthanum carbonate is a phosphate binder that must be thoroughly chewed before swallowing, as directed by FDA-approved labeling. Failure to chew the tablet results in the medication remaining intact, where its radio-opaque chemical properties create a solid, dense shadow that appears similar to metal on diagnostic imaging.
Timeline
The FDA first approved lanthanum carbonate for patient use in 2004.
Details of the latest medical case were published in the Journal of Radiology Case Reports in February 2026.
Health Landscape
This case follows a pattern established by the FDA drug labeling requirements for lanthanum carbonate. It illustrates how patient adherence to dosage instructions is critical for both therapeutic efficacy and the accurate interpretation of routine diagnostic imaging.
Patients prescribed phosphate binders must chew the tablets completely to ensure the drug dissolves and to avoid potential gastrointestinal blockages. If you are undergoing medical imaging, inform your radiologist of any current medications to help differentiate between pills and foreign objects.
The takeaway
This case serves as a reminder for patients to strictly follow medication administration instructions provided by their physicians. Proper preparation of prescribed drugs is essential for effective treatment and prevents unintended consequences during diagnostic procedures.
Further reading
For broader trends in medical reporting and diagnostic standards, visit the Healthcare section.
Source note: This article includes information reported by Medical Daily.
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