METHODS: This is a retrospective chart review of patients who underwent allo HCT between 2007 and 2016 at Makassed General Hospital in Beirut, Lebanon. ...The cumulative incidence of pre engraftment pneumonia was 11.2 . Patient age significantly increased the risk of pre engraftment pneumonia HR 12.35, 95 CI 1.27 120.50 , P 0.03 . ...