title: Significance of minimal or no intraperitoneal fluid visible on CT scan associated with blunt liver and splenic injuries: a multicenter analysis.
abstract: BACKGROUND
  The use of ultrasound (U/S) for the evaluation of patients with blunt abdominal trauma is gaining increasing acceptance. Patients who would have undergone computed tomographic (CT) scan may now be evaluated solely with U/S. Solid organ injuries with minimal or no free fluid may be missed by surgeon sonographers.
  
  
  OBJECTIVE
  The purpose of this study was to describe the incidence and clinical importance of liver and splenic injuries with minimal or no free intraperitoneal fluid visible on CT scan. We hypothesized that these solid organ injuries occur infrequently and are of minor clinical significance.
  
  
  METHODS
  Patient records and CT scans were reviewed for the presence of and outcome associated with blunt liver and splenic injuries with minimal (<250 mL) or no free fluid detected by an attending radiologist. Data were collected from six major trauma centers during a 4-year period before the introduction of U/S and included demographics, grade of injury (American Association for the Surgery of Trauma scale), need for operative intervention, and outcome.
  
  
  RESULTS
  A total of 938 patients with liver and splenic injuries were identified. In this group, 11% of liver injuries and 12% of splenic injuries had no free fluid visible on CT scan and could be missed by diagnostic peritoneal lavage or U/S. Of the 938 patients, 267 (28%) met the inclusion criteria; 161 had injury to the spleen and 125 had injury to the liver. In the 267 patients studied, 97% of the injuries were managed nonoperatively. However, 8 patients (3%) required operative intervention for bleeding. Compared with the liver, the spleen was significantly more likely to bleed (p = 0.01), but the grade of splenic injury was not related to the risk for hemorrhage (p = 0.051).
  
  
  CONCLUSIONS
  Data from this study suggest that injuries to the liver or spleen with minimal or no intraperitoneal fluid visible on CT scan occur more frequently than predicted but usually are of minimal clinical significance. However, patients with splenic injuries may be missed by abdominal U/S. We found a 5% associated risk of bleeding. Therefore, abdominal U/S should not be used as the sole diagnostic modality in all stable patients at risk for blunt abdominal injury.
authors.affiliation: Memorial Health University Medical Center, Savannah, Georgia 31403-2084, USA.
authors.forename: M G
authors.initials: MG
authors.lastname: Ochsner
authors.forename: M M
authors.initials: MM
authors.lastname: Knudson
authors.forename: H L
authors.initials: HL
authors.lastname: Pachter
authors.forename: D B
authors.initials: DB
authors.lastname: Hoyt
authors.forename: T H
authors.initials: TH
authors.lastname: Cogbill
authors.forename: C E
authors.initials: CE
authors.lastname: McAuley
authors.forename: F E
authors.initials: FE
authors.lastname: Davis
authors.forename: S
authors.initials: S
authors.lastname: Rogers
authors.forename: A
authors.initials: A
authors.lastname: Guth
authors.forename: J
authors.initials: J
authors.lastname: Garcia
authors.forename: P
authors.initials: P
authors.lastname: Lambert
authors.forename: N
authors.initials: N
authors.lastname: Thomson
authors.forename: S
authors.initials: S
authors.lastname: Evans
authors.forename: E J
authors.initials: EJ
authors.lastname: Balthazar
authors.forename: G
authors.initials: G
authors.lastname: Casola
authors.forename: M A
authors.initials: MA
authors.lastname: Nigogosyan
authors.forename: R
authors.initials: R
authors.lastname: Barr
mesh_terms: D000328:Adult; D001202:Ascitic Fluid / Q000000981:diagnostic imaging*; D002140:California; D005260:Female; D005845:Georgia; D006801:Humans; D015601:Injury Severity Score; D008099:Liver / Q000000981:diagnostic imaging / Q000293:injuries*; D008297:Male; D008499:Medical Records; D009519:New York City; D009820:Ohio; D012189:Retrospective Studies; D013154:Spleen / Q000000981:diagnostic imaging / Q000293:injuries*; D014057:Tomography, X-Ray Computed; D014193:Trauma Centers; D014463:Ultrasonography; D014922:Wisconsin; D014949:Wounds, Nonpenetrating / Q000000981:diagnostic imaging*