[Post-traumatic inter-hemispheric disconnection syndrome].
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Brain Injuries↗
Biomedical subjects
E Schouman-Clayes
Publications and source records attributed to E Schouman-Clayes.
Superparamagnetic iron oxide-enhanced magnetic resonance imaging of experimental liver tumors after mitomycin C administration.
The influence of mitomycin C chemotherapy on superparamagnetic iron oxide (SPIO) uptake by the liver was studied in rats (n = 70). This commonly used antineoplastic drug induces a decrease in the phagocytic function of the macrophage-phagocytic system (MPS). The plasma clearance of SPIO measured by relaxometry followed a biexponential model. The fast component half-life increased from 2.9 minutes in controls to 4.5 minutes in mitomycin C-treated animals. The slow component half-life increased from 11.3 to 36.7 minutes. Nevertheless, the magnetic resonance imaging (MRI) diagnostic efficacy 2 hours after infusion of the superparamagnetic agent AMI 25 (n = 10) was as satisfactory in the treated group as in the untreated one. These MRI results were consistent with the relaxometric T2* liver measurements, which were identical in both groups.
Animals↗
Liver tumors in cirrhosis: experimental study with SPIO-enhanced MR imaging.
The influence of cirrhosis on superparamagnetic iron oxide (SPIO)-enhanced magnetic resonance (MR) imaging of the liver was studied in 31 rats. Experimental models included carbon tetrachloride-induced cirrhosis and liver engrafting of rhabdomyosarcoma S4T cells. Hepatic uptake of SPIO measured with relaxometry decreased dramatically with histologic grade, while splenic uptake increased; the same results were achieved by calculating K values. Imaging of 13 tumorous cirrhotic rats confirmed these results by showing a muted decrease in liver signal intensity on spin-echo images after injection of SPIO. Nevertheless, all intrahepatic tumors could be visualized, as confirmed by postmortem examination. On gradient-echo images, postinjection contrast between the tumor and the liver was not affected by cirrhosis. Thus, despite strong impairment of hepatic uptake in cirrhosis, the diagnostic efficacy of MR imaging with SPIO did not seem to be significantly affected.
Animals↗