Objectives: To clarify and compare thin section CT findings andDoppler Ultrasound findings in the patients with previous acute deepvein thrombosis of lower extremity.Methods: Nine patients who had had apparent acute deep vein throm-bosis diagnosed by CT and followed up more than 2 month period wereenrolled in this study. Three min delayed phase indirect CT venographywith MDCT after 2 ml/kg of iodine contrast and Doppler ultrasoundsincluding 2D morphology and venous insufficiency with stand positionwere done. CT venography and Doppler ultrasound findings wereanalyzed and correlation of findings of both studies was done.Results: CT showed luminal obliteration (n � 4), residual thrombi (n� 8), and fibrotic band in lumen (n � 12). In these lesions, Dopplerultrasound demonstrated noncompressed low echoic thrombi (n � 6) orechogenic lines (n � 3). Doppler ultrasound demonstrated loss of flowfluctuation according to respiration at CFV segments with all fourobliterate iliac venous segments. Deep venous insufficiency was de-tected in 10 of 11 segments with abnormal CT findings and three ofnine segments with normal CT findings.Conclusions: CT features of chronic lower extremity deep venousthrombosis reveal strong correlation on sonographic findings. Abnor-mal findings on CT strongly suggest deep venous insufficiency ataffected segments.

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Observing the changes of diameter and unobstructed rate of thetransplanted vein after surgery of autogeneic graft of parallelBi-vein and Uni-vein with valves by color Doppler ultrasoundBo W, Ling HX, Ultrasound Dept., First Affiliated Hospital ofChongqing University of Medical Science, China, China

Objectives: To compare the unobstructed rate and observe the changesof diameter of the transplanted vein after surgery of autogeneic graft ofparallel bi-vein and uni-vein with valves.Methods: Twenty-four New Zealand rabbits were divided into exper-imental and control groups randomly. The inferior vena cava (IVC) wasundergone autogeneic graft of parallel bi-vein (experimental group) oruni-vein (control group) with valves. The unobstructed rate and thechanges of diameter of the transplanted vein was observed by colorDoppler ultrasound 1 d, 1 wk, 2 wk and 4 wk after surgery.Results: One day after surgery the diameter of the vessel and thespectrum of the flow returned to normal. At the time of 1 d, 1 wk and2 wk after surgery, the unobstructed rate of the transplanted vessels was100%. There was one rabbit in experimental group and control group,respectively, whose transplanted vein was obstructed at 4 wk becauseof the compression of the adhering zone of peritoneum. No thrombuswas observed in the transplanted vein in all animals during 4 wk aftersurgery.Conclusions: The unobstructed rate of the transplanted vein in theexperimental group and control group has no significant difference. Thediameter of the transplanted vein has no changes in all animals.

3575

Evaluation of intratumoral hemodynamics with color Dopplerimaging in patients with colorectal carcinomaIwasaki N, Okabe Y, Orino A, Kobe City General Hospital, Japan

Objectives: The aim of this study was to examine the relationshipbetween intratumoral hemodynamics and histopathologic characteris-tics in patients with colorectal carcinoma.Methods: A series of 82 patients with 28 well-differentiated adeno-carcinomas, 40 moderately differentiated adenocarcinomas, 10 poorlydifferentiated adenocarcinomas and four mucinous adenocarcinomasunderwent color Doppler examination and surgical treatment. Thewaveform of blood flow in the thickened wall of the colon was

analyzed by determining the maximum velocity (Vmax) and resistanceindex (RI). These parameters were compared with histopathologicfindings of the resected specimens.Results: Both Vmax and RI were higher in the invasive tumors ratherthan the expansive ones. Vmax and tumor size were not correlated;however, the RI increased proportionately with tumor size in tumorslarger than 4 cm in diameter. Both parameters increased with depth ofinvasion and histologic stage through stage IIIb. Both were markedlyhigher in mucinous adenocarcinomas than in the other histopathologictypes. Furthermore, Vmax in well-, moderately- and poorly differenti-ated adenocarcinomas did not differ significantly, although RI wasnegatively associated with the degree of differentiation.Conclusions: We concluded that blood-flow analysis is closely asso-ciated with histopathologic findings of colorectal carcinoma patients,and that it can provide valuable information for clinical management ofthese patients.

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Renal tumors and their mimics in end-stage renal diseaseLee HY, Kim SH, Kim SH, Lee HJ, Department of Radiology, SeoulNational University College of Medicine, Korea

One of the important clinical concerns with end-stage renal disease(ESRD) is the increased incidence of renal cell carcinoma. However,there are limitations of radiological work-up due to the fibrotic,shrunken kidney and decreased cardiovascular function. In addition,subsequently developed acquired cystic kidney diseases accompaniedby intracystic clot formation and fibrosis may mimic malignant diseaseon CT and ultrasound. These factors may cause difficulties in theaccurate preoperative diagnosis of renal tumors in patients with ESRD.In this exhibit, a variety of radiologic appearances of renal tumors andtheir mimics in ESRD will be presented and the diagnostic clues indifferentiation among them will be illustrated.

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The usefulness of routine transabdominal ultrasonography in theevaluation of upper gastrointestinal tractKim HC, Shin HC, Yang DM, Park SJ, Park SI, Kim YT, Kim IY,Soonchunhyang University, Cheonan Hospital, Korea; East-WestNeo Medical Center, Kyung Hee University, Korea; SoonchunhyangUniversity, Bucheon Hospital, Korea; Kwandong University Collegeof Medicine, Myongji Hospital, Korea

Although transabdominal ultrasonography (US) is routinely performedin patients with upper abdominal pain, upper gastrointestinal tract isoften ignored during examination. With recent technical advances,careful attention and effort during US examination may enable to detectunexpected lesions in the upper gastrointestinal tract. The purpose ofthis illustration is to demonstrate the US findings of various lesionsinvolving the stomach and duodenum, detected during routine trans-abdominal US without any ingestion of water or paralytic agent. TheUS findings are correlated with the comparative studies of gastroscopy,CT, endoscopic US or barium studies of upper gastrointestinal tract.Specific topics addressed include inflammation, ulcer, submucosalmass, adenocarcinoma and miscellaneous diseases involving the stom-ach and duodenum and postoperative complications after gastric sur-gery. Dedicated examination of upper gastrointestinal tract duringroutine transabdominal US may be a useful and convenient method fordetecting abnormalities of the stomach and duodenum.

Abstracts P289