title: Potential for differential diagnosis with gadolinium-ethoxybenzyl-diethylenetriamine pentaacetic acid-enhanced magnetic resonance imaging in experimental hepatic tumors.
abstract: OBJECTIVE
  To investigate whether dynamic and delayed magnetic resonance imaging (MRI) with gadolinium-ethoxybenzyl-diethylenetriamine pentaacetic acid (Gd-EOB-DTPA), a hepatobiliary MRI contrast agent, has potential for the differential diagnosis of experimental hepatic tumors.
  
  
  METHODS
  Twelve male rats received N-nitrosomorpholine solution as drinking water to induce hepatic tumors. After injection of Gd-EOB-DTPA, rats were subjected to dynamic and delayed MRI. The relative enhancement (RE) was calculated, and the time of the maximum RE (Tmax) was evaluated. After MRI, liver was histologically analyzed.
  
  
  RESULTS
  One hundred sixty-three hepatic tumors 3-12 mm in diameter were induced after 18 weeks of treatment with 0.01 wt/vol% of N-nitrosomorpholine, and 81 of them were evaluated. The RE in hyperplastic nodules (HPNs) was significantly higher than that in moderately or poorly differentiated hepatocellular carcinomas (HCCs) in the late phase, whereas there was no significant difference in RE between well-differentiated HCCs and HPNs. The average Tmax in HPNs was about 13 minutes, whereas that of each differentiated HCCs was about 1 minute.
  
  
  CONCLUSIONS
  It was possible to differentiate benign HPNs and malignant HCCs (especially well-differentiated HCCs) by evaluating the change of RE or comparison of Tmax with Gd-EOB-DTPA-enhanced MRI.
authors.affiliation: Preclinical Development Department and dagger Drug Discovery Institute, Nihon Schering K. K., Yodogawa-ku, Osaka, Japan.
authors.forename: Natsuko
authors.initials: N
authors.lastname: Tsuda
authors.forename: Naoki
authors.initials: N
authors.lastname: Kato
authors.forename: Chie
authors.initials: C
authors.lastname: Murayama
authors.forename: Michiko
authors.initials: M
authors.lastname: Narazaki
authors.forename: Takashi
authors.initials: T
authors.lastname: Yokawa
mesh_terms: D000818:Animals; D003287:Contrast Media; D003937:Diagnosis, Differential; D004195:Disease Models, Animal; D019786:Gadolinium DTPA; D007089:Image Enhancement; D008113:Liver Neoplasms / Q000175:diagnosis*; D008114:Liver Neoplasms, Experimental / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D051381:Rats; D013997:Time Factors
chemical_list: D003287:Contrast Media; C073590:gadolinium ethoxybenzyl DTPA; D019786:Gadolinium DTPA