Purpose
To evaluate frequency rate of false-positive results of the helical CT in patients with liver metastases.
Methods and Materials
Helical CT of 65 patients with metastatic lesions of the liver (29 male and 36 female) aged 32 to 65 years were analyzed retrospectively. The CT studies were performed using multislice helical scanner "Somatom Volume Zoom" (Siemens) with slice collimation 4 x 5 mm, slice thickness 5 mm and table motion 25 mm per tube rotation. After obtaining native images, the contrast study was performed using. Omnipaque 300, 1.5 ml/kg. Arterial, portal vein and venous phases were evaluated (20, 50 and 200 s, respectively). The...
Results
The results of helical CT were not confirmed by the data of intraoperative operative and US interventions in 5 patients (8%). In all of them one or two contrast phases of multislice helical CT showed focal changes of hepatic parenchyma that were evaluated as metastatic ones: in three patients multifocal and in two patients solitary, of 4 to 12 mm in diameter. Moreover, in three of these five patients routine US also showed focal changes with localization coincided with that on helical CT (see table...
Conclusion
Focal changes seen in one or two phases of helical multiphase CT of the liver may be false-positive, even in coincidence with US findings (1). The cause of false-positive results requires subsequent study.
References
1. M. Kanematsu, H. Hoshi, T. Imaeda, Y. Yamawaki, S. Mizuno, T. Manabe, M. Enya,R. Yokoyama. Nonpathological focal enhancements on spiral CT hepatic angiography. //Abdom Imaging 1997. -22:55-59
Personal Information
E. V. Rozengaouz, L. A. TyutinThe radiology department of the Central reseach Institute of Roentgenology and Radiology, Saint-Petersburg, RussiaE.V. Rosengaouz / L. A. Tyutin