Pedram Rezai MD, Presenter: Grant, Siemens AG

Sandra M. Tochetto MD, Abstract Co-Author: Grant, Siemens AG

Mauricio Stanzione Galizia MD, Abstract Co-Author: Grant, Siemens AG

Vahid Yaghmai MD, Abstract Co-Author: Nothing to Disclose

Accurate quantification of perinephric hematoma is important in planning resuscitation of trauma patients. However, perinephric hematomas are difficult to quantify on 2D images due to their irregular shape and the intervening kidney. The purpose of this study was to evaluate the feasibility of volumetric perinephric hematoma quantification using semi-automated segmentation software.

This retrospective, HIPPA compliant study was approved by IRB. 18 patients (13 males, 5 females; median age, 51.5 years) with perinephric hematoma who underwent contrast enhanced abdominal MDCT were evaluated. Ipsilateral kidney and combined ipsilateral kidney/hematoma were segmented separately by a semiautomated segmentation software. Volumes were calculated using voxel-by-voxel analysis of segmented volumes and hematoma volume was then obtained by subtracting the renal volume from the combined renal and hematoma volume.  

Perinephric hematoma volume was quantified in all cases. Average segmentation time from start to finish was 4 minutes. Hematoma volume ranged from 87.85 mL to 2431.30 mL. Mean hematoma volume was 587.07 mL (95%CI, 263.40-910.71). Size of the hematoma did not affect segmentation.  

Perinephric hematoma volume can be quantified using semi-automated segmentation software.

Quantification by segmentation software provides simple and accurate assessment of blood-loss in trauma patients with perinephric hematoma.

Rezai, P, Tochetto, S, Galizia, M, Yaghmai, V, Quantification of Perinephric Hematoma Volume on MDCT.  Radiological Society of North America 2009 Scientific Assembly and Annual Meeting, November 29 - December 4, 2009 ,Chicago IL. http://archive.rsna.org/2009/8012326.html