NEW YORK — Billy Wagner has more pain and swelling in his pitching elbow, and the New York Mets' All-Star closer is out indefinitely.

Wagner had an MRI exam today that revealed additional inflammation in his left elbow — an alarming sign. The NL East leaders don't know when Wagner might be able to return to the mound, if at all, this season.

The Mets had hoped to activate Wagner from the disabled list Monday in Pittsburgh. But he felt discomfort in his elbow after throwing a simulated game Saturday and was sent back to New York for further evaluation.