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Gastrointestinal Imaging |
1 From the Departments of Medical Imaging (C.Y.C., J.S.H., T.S.J., G.C.L.), Radiology (J.S.H., T.S.J., G.C.L.), Medical Gastroenterology (D.C.W.), Pathology (W.Y.K.), Surgery (J.S.H.), and Public Health (M.T.W.), Kaohsiung Medical University, Chung-Ho Memorial Hospital, 100 Tz-You 1st Road, Kaohsiung, Taiwan. From the 2004 RSNA Annual Meeting. Received September 19, 2005; revision requested November 14; revision received December 22; accepted January 23, 2006; final version accepted May 15. Address correspondence to G.C.L. (e-mail: gcliu{at}kmu.edu.tw).
Purpose: To prospectively evaluate accuracy of multi–detector row computed tomographic (CT) images for preoperative staging of gastric cancer by using surgical and histopathologic results as reference standards.
Materials and Methods: This study had institutional review board approval; informed consent was obtained from all patients. Multi–detector row CT included acquisition of virtual gastroscopy images after air distention and contrast material–enhanced dynamic transverse and multiplanar reformation (MPR) images after water distention. Fifty-five consecutive patients with gastric cancer (38 men, 17 women; age range, 37–84 years; mean age, 63 years) underwent preoperative CT. All received 6 g of gas-producing crystals before unenhanced CT scanning for gastric distention and virtual gastroscopy. Patients drank 800–1000 mL of tap water to establish a background for dynamic contrast-enhanced CT scans. Images were obtained in late arterial, portal venous, and delayed phases with start delays of 40, 70, and 150 seconds, respectively. All patients underwent surgery. CT findings were compared with surgical and histopathologic results. Differences in accuracy of transverse and MPR images for T and N staging were assessed with the McNemar exact test. Statistical significance was inferred at P < .05.
Results: Detection rates of primary tumors with transverse images, MPRs, and combinations of MPR and virtual gastroscopy images were 91% (50 of 55), 96% (53 of 55), and 98% (54 of 55), respectively. Overall accuracy in assessment of tumor invasion of the gastric wall (T stage) was significantly better with MPR images (89% [49 of 55]) than with transverse images (73% [40 of 55]) (P < .01). Overall accuracy for lymph node (N) staging was 78% (43 of 55) with MPR images and 71% (39 of 55) with transverse images. This difference was not significant (P = .103).
Conclusion: Multi–detector row CT with combined water and air distention can improve the accuracy of preoperative staging of gastric cancer. MPRs yield significantly better overall accuracy than transverse images for tumor staging but not for lymph node staging.
© RSNA, 2007
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