RT Journal Article SR Electronic T1 Spontaneous resolution of pneumopericardium in a preterm infant JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e230339 DO 10.1136/bcr-2019-230339 VO 12 IS 5 A1 Vishal Sidana A1 Rathnapratheep Rajasekaran A1 Jogender Kumar A1 Kanya Mukhopadhyay YR 2019 UL http://casereports.bmj.com/content/12/5/e230339.abstract AB