Preoperative Assessment of Rectal Cancer: Value of Two-Phase Dynamic CT.
10.3348/jkrs.1995.32.3.441
- Author:
Jin Geun KWAG
;
Young Ran OH
;
June Sik CHO
;
Gil Hyun KANG
;
Chang Lak CHOI
;
Byoung Chul RHEE
- Publication Type:Original Article
- MeSH:
Humans;
Lymph Nodes;
Neoplasm Metastasis;
Neoplasm Staging;
Prospective Studies;
Rectal Neoplasms*;
Sensitivity and Specificity;
Water
- From:Journal of the Korean Radiological Society
1995;32(3):441-446
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: The purpose of this study was to evaluate the utility of two-phase dynamic CT, early and equilibrium pahse, in the preoperative staging of rectal cancers. MATERIALS AND METHODS: We performed incremental dynamic CT after rectal infusion of water in 34 patients with pathologically proved rectal cancers. Two-phase dynamic CT findings were prospectively analyzed and correlated with surgical and histopathologic findings. A total of 150ml of nonionic contrast medium was intravenously administered with a power injector at a flow rate of 5ml/sec for 30 sec, and two-phase images were obtained at 30 sec(early phase) and 2 min (equilibrium phase) after bolus injection. Local tumor staging and regional lymph node were classified by TNM staging. RESULTS: All 34 rectal cancers showed a moderate to marked enhancement in the early phase and a homogeneous and prolonged enhancement of the entire lesion in the equilibrium phase. T-staging of primary tumors were 85.3%(29/34) in early phase and 70.6%(24/34) in equilibrium phase. The accuracy in determining the perirectal fat invasion of rectal cancer was 92%(23/25) in early phase, and 72%(18/25) in equilibrium phase. The sensitivity & specificity of the regional lymph node metastasis were 63.6% and 79.1% in early phase, and 54.5% and 65.2% in equilibrium phase, respectively. CONCLUSION: Early phase dynamic CT was more accurate for the preoperative staging of rectal cancer than that at equilibrium phase.
