• Isabel Oliva, Maria Mennicke, Kavita Gulati, Katja Goldflam, Hicham Skali, Stephen Ledbetter, and Elke Platz.
• Department of Surgery, Tiefenauspital, 3004 Bern, Switzerland.
• Am J Emerg Med. 2012 Sep 1;30(7):1025-31.

ObjectivesWe sought to assess the anatomical distribution of traumatic pneumothoraces (PTXs) on chest computed tomography (CT) to develop an optimized protocol for PTX screening with ultrasound in the emergency department (ED).MethodsWe performed a retrospective review of all chest CTs performed in one ED between January 2005 and December 2008 according to presence, location, and size of PTX. Pneumothoraces were then measured and categorized into 14 anatomical regions for each hemithorax.ResultsA total of 277 (3.8%) PTXs were identified, with 26 bilateral PTX, on 3636 chest CTs performed during the study period. Etiology was blunt (85%) or penetrating trauma (15%). Eighty-three (45%) PTXs were radiographically occult on initial chest x-ray. One hundred eighty-three (66%) PTX had no chest tube at the time of CT. For both hemithoraces, the distribution demonstrated increasing PTX frequency and size from lateral to medial and from superior to inferior. Region 12 (parasternal, intercostal spaces [ICS] 7-8) was involved in 68% of PTX on either side; region 9 (parasternal, ICS 5-6), in 67% on the left and in 52% on the right; and region 11 (lateral to midclavicular line, ICS 7-8), in 46% on the left and in 53% on the right. The largest anterior-to-posterior PTX dimension was seen in region 12.ConclusionsOur results indicate that 80.4% of right- and 83.7% of left-sided traumatic PTXs would be identified by scanning regions 9, 11, and 12. These findings suggest that a standardized protocol for PTX screening with ultrasound should include these regions.Copyright © 2012 Elsevier Inc. All rights reserved.

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