"The results confirmed that the tumor was a lung adenocarcinoma and that the disease was localized. A subsequent oncological assessment has confirmed that no further treatment is necessary."
He was discharged Saturday after blood tests and a chest X-ray confirmed he was well enough to return to the Vatican. Thousands of supporters gathered outside the hospital, shouting "Papa!" as he departed.
Before leaving, Leo visited the children’s oncology ward, where young patients had sent him letters during his hospital stay.
"Pope Leo, our prayers are for you," a girl named Eleonora wrote in a letter released by Vatican News.
"May God, the Most Holy Virgin, and the guardian angels always protect you," she added.
Eleonora’s mother told the pope her daughter was now healthy, according to the Vatican.
"Faith moves mountains," Eleonora wrote. "God has heard our prayers."
Fox News Digital's Robert McGreevy contributed to this report.