10/13/2026
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Following the Holy Father's operation at Gemelli Hospital Oct. 13, his doctors' statement confirmed a lung cancer diagnosis. Here's everything we know so far:
๐ What's the diagnosis? According to the doctors' statement after surgery, "The intraoperative histological examination confirmed the diagnosis of lung adenocarcinoma, as suspected by the preoperative tests."
Adenocarcinoma of the lung is the most common form of lung cancer in the United States. It represents about 40% of all lung cancers, according to the Lung Cancer Foundation of America.
๐ "To ensure the surgery was radical, the lower lobe of the right lung was removed using a video-assisted technique."
The right lower lobe (RLL) is the largest of the three lobes in the right lung, located in the posterior and inferior part of the right chest cavity. It contributes roughly 30% of total lung capacity, making it the single largest lung lobe, according to the Baylor College of Medicine.
๐ From Pope Leo's message after the Angelus on Oct. 11: "The doctors found a small, localized nodule in my lung. It was detected at a very early stage and is well-localized."
While lung nodules are very common and most often benign, the term "nodule" is also reserved for anomalies that are smaller in size -- less than 3 cm -- compared to a lung mass, according to Dr. Sonali Sethi, an interventional pulmonologist at the Cleveland Clinic.
๐ "The Holy Father was in the operating room for about 3 hours; the surgery itself lasted approximately 90 minutes," the statement said. "After the surgery, the pope woke up as expected and, following a brief period of observation, returned to his room on the 10th floor."