Pope Leo Diagnosed With Lung Cancer After Successful Surgery to Remove Part of His Right Lung

By The News Desk, Previously

October 14, 2026

The Vatican said Tuesday's operation at Rome's Gemelli Hospital went as planned: the lower lobe of Pope Leo XIV's right lung was removed, and tissue tests confirmed the lung adenocarcinoma doctors had suspected before surgery.

Pope Leo XIV is recovering in a tenth-floor room at Rome's Gemelli Hospital after surgeons removed the lower lobe of his right lung on Tuesday and confirmed what pre-operative tests had already suggested: the 71-year-old pontiff has lung cancer. Reuters reported that the Vatican's medical bulletin described the operation as successful and without complications, and USA Today reported that tissue examined during the procedure confirmed a diagnosis of lung adenocarcinoma, the most common type of non-small-cell lung cancer. It is the first significant medical procedure of Leo's papacy, and the Vatican announced it the same afternoon the surgery took place — a level of disclosure the Holy See has not always offered about a pope's health.

A Nodule Found on a Routine Check

The surgery grew out of an ordinary appointment. According to the Vatican, doctors discovered a small nodule on one of the pope's lungs during a recent medical checkup and recommended removing it. Leo himself disclosed the finding during his Sunday noon prayer, telling the faithful gathered in St. Peter's Square that the nodule would come out on Tuesday — an announcement that set this week's events in motion and that we covered ahead of the operation in our earlier report on the scheduled surgery.

On Tuesday, Reuters reported, Leo arrived at the Agostino Gemelli University Hospital, walked in through the main entrance and waved to the well-wishers who had gathered outside. The operation was led by Professor Stefano Margaritora, the hospital's chief thoracic surgeon. The Vatican said the pope spent about three hours in the operating room in total, with the surgery itself lasting roughly 90 minutes, and that he woke up normally afterwards, spent a brief period under observation, and then returned to his room on the tenth floor — the floor where Gemelli keeps its papal suite, which is currently undergoing renovation, so Leo is staying in a nearby room instead.

What the Surgeons Found

The central news in the Vatican's bulletin was the pathology. Surgeons removed the entire lower lobe of the right lung, and histological examination of the tissue during the operation confirmed pulmonary adenocarcinoma — the same diagnosis pre-operative tests had pointed to, according to the medical bulletin reported by Reuters and by NPR. The Vatican said previously that the growth appeared small and localised, and officials have said the resection was performed to remove the affected tissue completely.

What the Vatican has not announced is any further treatment — no chemotherapy, no radiation, no follow-up regimen has been disclosed, and the bulletin made no mention of a cancer stage. That silence should be read as exactly what it is: the Holy See has said the surgery succeeded and the diagnosis is confirmed, and it has not yet said what, if anything, comes next medically. Anything beyond that would be speculation, and this story will be updated when the Vatican speaks again.

What This Cancer Is — and Is Not

Adenocarcinoma is the most common form of lung cancer in the United States, accounting for about 40 percent of cases, according to the Lung Cancer Foundation of America figures cited by NPR. It arises in the glandular cells that line parts of the lung and is the type most often found in people who have never smoked; Leo is not known to be a smoker, NPR reported, though there is a history of cancer in his family — his mother Mildred died of cancer in 1990, and the Vatican noted this week that his older brother Louis, who lives in Florida, is currently hospitalised with a form of cancer.

Context matters in the other direction, too. A lung nodule by itself is not a cancer diagnosis: according to the American Thoracic Society, fewer than five percent of lung nodules overall turn out to be cancerous, a figure USA Today cited in explaining why doctors watch many nodules rather than operate. In Leo's case, the pre-operative testing pointed the other way, and the tissue results confirmed it. Dr. Diego Avella-Patiño of the Sylvester Comprehensive Cancer Center at the University of Miami told USA Today that patients typically recover from this kind of surgery in about two to three weeks, depending on their overall health — a general medical observation about the procedure, not a statement about the pope's individual case.

A Papacy With No Understudy

There is a structural fact that makes a pope's illness different from any other world leader's: the pope is the ultimate earthly authority for the world's roughly 1.4 billion Catholics, and there is no deputy who steps in when he is sick, as USA Today pointed out in its coverage. The machinery of the Vatican slows; it does not transfer. The Holy See moved on Monday to cancel all of Leo's audiences and public events through October 20, and the Vatican expects him to spend about a week in the hospital before returning to the Vatican.

At 71, Leo is relatively young for a modern pope and has kept an active routine — weekly workouts, tennis with his personal secretary, horse riding at Castel Gandolfo, as NPR noted. That underlying fitness is part of why the announcement still landed as a shock: this is a pontiff seventeen months into his papacy, elected as a vigorous successor, now beginning it again from a hospital room. The story was among the biggest in the world overnight, and it leads our Wednesday wrap of the day's major stories as well.

The November Question

The first concrete test of the recovery timeline is already on the calendar. Leo is scheduled to begin an eleven-day tour of Uruguay, Argentina and Peru on November 6 — his first major international trip of the autumn, in a region close to his own history as a missionary and bishop in Peru. The Vatican has not cancelled the trip, and nothing in Tuesday's bulletin addressed it. Set against the two-to-three-week general recovery window described to USA Today, a November 6 departure roughly three and a half weeks after surgery is possible but tight, and the honest answer tonight is that nobody outside the pope's medical team knows — and they have not said.

For now, the facts are these: the surgery is done, it went as planned, the diagnosis is lung adenocarcinoma, and the pope is awake and resting on Gemelli's tenth floor. The Vatican's next medical bulletin will carry the story from here, and Previously will update this report when it arrives.