Perinephric hematoma: Semi-automated quantification of volume on MDCT: A feasibility study

Pedram Rezai, Sandra Tochetto, Mauricio Galizia, Vahid Yaghmai*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Background: To evaluate feasibility and reproducibility of quantification of perinephric hematoma volume on multidetector-row CT (MDCT). Methods: Perinephric hematomas in 63 patients (42 males, 21 females, median age: 49 years) imaged with contrast-enhanced MDCT of the abdomen were evaluated. A semi-automated segmentation software was applied to quantify hematoma volume. Reproducibility for quantification of hematoma volume was evaluated by repeated measurements in 20 patients. Statistical analyses were performed by using Student's t test. Interobserver and intraobserver variability was evaluated by Bland-Altman plots. P < 0.05 denoted statistical significance Results: Quantification of hematoma volume was feasible in all cases. One step, direct quantification of volume was possible in 21 patients (33.33%) with small hematomas that did not reach upper and lower renal poles (range: 3.12-183.98 mL; mean: 39.92 mL). Quantification of hematoma size was performed indirectly in 42 patients (66.67%) with larger hematomas that extended beyond the renal poles by subtracting the ipsilateral renal volume from the combined kidney and hematoma volumes (range: 27.08-2431.3 mL; mean: 435.31 mL). Mean quantification time was 45 and 71 s for small and large hematomas, respectively (P < 0.05). Mean intraobserver and interobserver variability for determination of hematoma volume was 0.14% (95% CI, -1.57% to 1.85%) and 2.04% (95% CI, -1.77% to 5.85%), respectively. There was no significant difference in renal volume between ipsilateral and contralateral kidneys (P > 0.05). Conclusion: Quantification of perinephric hematoma was feasible from MDCT data in all patients and was reproducible.

Original languageEnglish (US)
Pages (from-to)222-227
Number of pages6
JournalAbdominal Imaging
Issue number2
StatePublished - Apr 1 2011


  • Multidetector-row computed tomography
  • Perinephric hematoma
  • Semi-automated segmentation
  • Volumetry

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging
  • Gastroenterology
  • Urology

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