The slight renal insufficiency the pope had in recent days subsided and a CAT scan of the chest showed a normal evolution of the pulmonary inflammatory picture.

Pope Francis has shown a "further, slight improvement" in his medical condition, the Vatican said on Wednesday, in a sign of progress as the 88-year-old pontiff battles double pneumonia. The pope is spending his 13th night at Rome's Gemelli hospital,

Concerns over Pope Francis' health have mounted in recent years as have questions about his succession. Here's what we know.