The 71-year-old underwent surgery to remove the lower lobe of his right lung on Tuesday, the Vatican said Pope Leo XIV was diagnosed with lung adenocarcinoma, more commonly known as Lung Cancer .
Here’s what to know about the disease, including what it is, its symptoms, warning signs, causes and when to seek medical attention. Adenocarcinoma is the most common form of non-small cell lung cancer (NSCLC). It is a type of cancer that develops in glandular cells that produce substances such as mucus. In the lungs, it usually develops in cells lining the small airways and air sacs.
Adenocarcinoma accounts for around 80%-85% of lung cancer cases. Adenocarcinoma makes up approximately 40% of all lung cancer cases, according to the Lung Cancer Foundation of America.
It is typically found in the outer parts of the lungs and tends to grow more slowly than some other forms of lung cancer, increasing the chances of detection before it has spread. The lower lobe of his right lung has been removed after the diagnosis. Pope Leo XIV has been diagnosed with lung cancer , according a statement by the Vatican on October 13, 2026 Earlier reporting noted: The 71-year-old spiritual leader of the Roman Catholic Church was in the operating room for about 3 hours, and the surgery itself lasted approximately 90 minutes.
Earlier reporting noted: Pope Leo XIV undergoes surgery for cancer: What is lung adenocarcinoma? Earlier reporting noted: The surgery was successful and there were no complications.
For patients whose cancer is confined to the lung, surgery offers the best chance of a cure. Other treatment options may include chemotherapy, radiotherapy, targeted therapy and immunotherapy depending on the stage of the cancer. The Vatican has yet to disclose whether the Pope will require any additional treatment following the surgery.
