Pneumatoceles in pediatric blunt trauma: Common and benign

Abstract

IntroductionTraumatic pneumatoceles are reported to be rare in children and to have an uncertain clinical significance. We report a single institution series of traumatic pneumatoceles to better define their frequency and clinical significance. MethodsAfter obtaining approval from the IRB, data were extracted from the trauma registry of a level 1 pediatric trauma center on children diagnosed with a pulmonary contusion (International Classification of Diseases-9th edition diagnosis codes: 861.21 to 861.31) who presented between June, 2006 and September, 2016. Patient demographics, mechanism of injury, injury severity score, diagnosis and procedure codes, length of hospital stay, outcome, imaging techniques and findings with attention to the identification of a pneumatocele, were examined. ResultsOf the 10,229 trauma admission, 204 children were identified as having a pulmonary contusion, 25 of whom (12.3%) were diagnosed with a pneumatocele. Their mean age was 13years (3–17). Seventy-six percent (19) were male. The most common mechanism of injury was a motor vehicle collision (10), followed by falls (6), and sports (5). Sixteen children (64%) suffered a long bone fracture, 12 (48%) an abdominal solid organ injury and 3 (12%) a traumatic brain injury. The mean Injury Severity Score was 17 (9–34). Twenty-three patients presented as transfers. There were no fatalities. The pneumatocele was identified on chest computerized tomography (CT) alone in 15 (60%), on chest CT and chest radiograph (CXR) in 3 (12%), the upper portions of an abdominal CT in 6 (24%) and on CXR alone in 1 (4%). Seven patients were found to have a solitary pneumatocele and 18 patients had 2 or more. The largest pneumatocele was 3.7cm in diameter. Ten children (40%) were admitted to the intensive care unit, 3 of whom required intubation. One patient (4%) had a respiratory complication: pneumonia. Three patients underwent chest tube placement for: pneumothorax, hemothorax and hemopneumothorax. No child underwent intervention specific to the pneumatocele. Seventeen (68%) patients were seen in follow-up in Trauma Clinic and the remainder by another practitioner ranging from 1week to 6months after injury. One child (4%) underwent a follow-up chest CT to rule out a congenital pulmonary malformation 6months after injury and this demonstrated complete resolution of the pneumatocele. ConclusionThe incidence of traumatic pneumatoceles among children with a pulmonary contusion was 12.3% in this series, but is probably higher given that only 24% were visible on radiographs and a small minority of children with pulmonary contusions underwent chest CT. Pneumatoceles are common in children with pulmonary contusions, but are usually small. The majority do not appear to be clinically significant nor require follow-up imaging. Level of evidenceIV.