RT Journal Article SR Electronic T1 Heterotopic ossification encasing a plombage cavity JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 1120 OP 1121 DO 10.1136/thoraxjnl-2012-201715 VO 67 IS 12 A1 Sarah G Watson A1 Simon L F Walsh YR 2012 UL http://thorax.bmj.com/content/67/12/1120.abstract AB