Search

Forty-three patients who were scheduled to undergo a percutaneous liver biopsy were evaluated with Doppler sonography to determine the hepatic arterial resistive index (RI). The histologic specimens were graded by a pathologist regarding cirrhosis and inflammation. The specimens demonstrated no cirrhosis in 12 of 43 (28%) patients, early cirrhosis in 10 of 43 (23%), and established cirrhosis in 21 of 43 (49%). Analysis also revealed that inflammation was absent in three of 43 (7%) patients, minimal in seven of 43 (16%), mild in 17 of 43 (40%), moderate in 13 of 43 (30%), and severe in three of 43 (7%). Hepatic artery RIs (without correction for heart rate) ranged from 0.64 +/- 0.06 in patients with early cirrhosis to 0.68 +/- 0.09 in patients with severe inflammation. There was no significant correlation between the degree of cirrhosis and/or inflammation and hepatic artery RI (with or without correction for heart rate). We conclude that Doppler determination of hepatic artery RIs is not a reliable method of predicting the severity of hepatic cirrhosis and/or inflammation.

With the large numbers of screening CT scans and ultrasounds performed in a busy radiologic practice, it is not uncommon to discover an unexpected focal or diffuse process in the liver. When there is no history of primary malignancy, many of these lesions are benign. We discuss the variety of benign focal and diffuse diseases that can be readily imaged within the liver using ultrasound, CT, and MR.

With today's imaging technology, relatively invasive procedures can be performed in the radiology department without significant complication. Biopsies, in particular, are frequently performed using computed tomography (CT) or ultrasound (US) guidance. In this article, both the indications and methods for imaging-guided percutaneous biopsy of the kidney and adrenal gland are reviewed. Citing the experience of several authors, the accuracy and complications of such procedures are also discussed.

A prospective multi-institutional study was performed to compare the sensitivity of computed tomography (CT) and high-field magnetic resonance (MR) imaging (1.5T) in the detection of hepatic metastases. T1-weighted and 72-weighted spin-echo (SE) MR images were compared with noncontrast, dynamic, and delayed CT. Sixty-nine oncology patients were studied. Noncontrast CT showed an overall sensitivity of 57%, dynamic CT 71%, delayed CT 72%, T1-weighted SE MR 47%, and T2-weighted SE MR 78%. Although there was no statistically significant (p less than 0.05) difference among dynamic CT, delayed CT, and T2-weighted SE MR, these three methods were significantly more sensitive (p less than 0.005) than noncontrast CT or T1-weighted SE MR. T2-weighted SE MR was significantly more sensitive (p less than 0.006) than CT or T1-weighted SE MR in the detection of small (less than 1 cm) lesions. CT was more sensitive in the detection of extrahepatic disease. These data confirm the superiority of T2-weighted SE over T1-weighted SE pulse sequences at 1.5T.

Le cycle d’une souche senegalaise de Fasciola gigantica a ete realise en France a partir d’adultes recueillis dans le foie de Bovins (Bos taurus ) naturellement parasites. Des Lymnaea natalensis experimentalement infestees ont emis de nombreuses cercaires. Les metacercaires ont permis d’infester avec succes des moutons.Chez le miracidium, des variations sont observees dans la disposition de la cellule medio-ventrale du deuxieme etage. La repartition des organites argyrophiles superficiels est identique a celle du miracidium de F. hepatica .La chetotaxie de la cercaire est tres proche de celle de la cercaire d’une souche malgache de F. gigantica emise par Lymnaea hovarum , mais differe nettement de celle de la cercaire de F. hepatica .L’enkystement d’un grand nombre de cercaires (25 %) a la surface de l’eau conduit a penser que ce phenomene favorise dans une large mesure l’extension des foyers de contamination et accroit grandement les risques d’infestation tant pour l’animal que pour l’homme. Il est possible que la distomatose humaine a F. gigantica constitue une parasitose dont l’importance est sous-estimee.

A model for the reactions Kp → Qp is given assuming dominance of pomeron and ω, f exchanges. The coupling of the pomeron is taken in accord with s-channel helicity conservation (SCHC) and both real and imaginary parts of the SCH amplitudes for ω and f exchange have a t-structure in accord with amplitude analyses. The model was fitted to the 8.2 GeV/c K−p and 7–9 GeV/c K+p data and is seen to describe satisfactory the dσ/dt and (dσ/dt) ϱij distributions. A cross-over is predicted at ‖t′‖ = 0.18±0.03 which is consistent with experimental data. The energy dependence of the cross section predicted for 4 < Plab ⩽ 14 GeV/c is in good agreement with experimental data K+ and K0. The model predictions concerning s- and t-channel helicity conservation are in good agreement with current experimental data while the model predicts that for beam momenta higher than 30 GeV/c, SCHC should be apparent in all the reactions K± → Q±p, K0p → Q0p andK0p → →Q0p.

Les formations argyrophiles superficielles du miracidium et de la cercaire de P. phillerouxi Dinnik, 1961, sont decrites en detail. Celles du miracidium sont identiques par leur nombre et leur disposition aux formations observees chez quelques miracidiums d’autres especes du genre. Par contre la chetotaxie de la cercaire differe de celle de la cercaire de P. togolense (Albaret et coll., 1978) et parait donc constituer un bon critere pour la taxonomie de ce groupe.

Cercarial chaetotaxy of Gastrodiscus aegyptiacus (Paramphistomoidea), parasite of the Horse, is described. Cercariae were shed by experimentally infected Bulinus forskalii. This description is the first one of a Gastrodiscidae. The cercarial chaetotaxy of the Gastrodiscidae is quite different from those of Paramphistomoidea and Diplodiscidae.

Etude au M. E. B. des teguments dorsaux anterieurs des mâles de S. haematobium chez des Rongeurs.La morphologie normale n’est observee que chez les mâles in copula, apres au moins 100 jours d’infestation. La distinction avec les especes proches obtenues experimentalement chez les Rongeurs est facile :—bovis : pas d’epines sur les tubercules ;—haematobium : tubercules de 10-15 µm de diametre avec epines serrees ; —curassoni : tubercules de plus de 15 µm de diametre avec epines grosses et serrees ; —intercalatum : tubercules de moins de 10 µm de diametre avec epines espacees.Il est suggere que les trois genotypes d’haematobium A, B et D pourraient etre legerement differents :A : epines pointues, presence de petites epines entre les tubercules ;B : epines pointues, pas de petites epines entre les tubercules ;D : epines a pointe mousse.Par ailleurs, les durees de prepatence chez les Mollusques pourraient etre differentes : A 72-86 jours, B 38-46 jours, D 55-58 jours.La distinction entre A, B et D ne repose que sur un tres petit nombre de donnees et les conclusions a ce sujet sont donc tres hypothetiques.

Etude de nombreuses cercaires du Senegal, provenant soit de mollusques spontanement infestes, soit de mollusques infestes avec des oeufs preleves dans des urines humaines ou dans des foies de mouton et etude des oeufs des schistosomes correspondants. La position relative des sensilles dorsales des cercaires fournit un "indice AD" et le rapport longueur sur largeur des oeufs un "indice L/I". Dans le stade actuel du travail, les donnees epidemiologiques sont incompletes, certaines des donnees experimentales sont imparfaites et l'analyse iso-enzymologique des adultes correspondant aux souches etudiees n'est pas encore faite. Cependant, les donnees fournies par les indices AD et L/I sont concordantes et conduisent a admettre l'existence d'une espece differente de mattheei, de haematobium et de bovis, espece qu'a la suite de Brumpt et de Gretillat, nous nommons Schistosoma curassoni. Si l'on se fie a ces indices, l'enquete indique que : a) S. mattheei n'a pas ete trouve au Senegal, b) S. bovis y devient assez rare, c) S. haematobium semble exister a l'etat pur en Casamance et serait melange a S. curassoni chez l'Homme dans le Nord et dans l'Est, d) S. curassoni semble l'espece dominante chez les ruminants domestiques et chez l'Homme dans le Nord et dans l'Est, e) Bulinus umbilicatus serait le vecteur principal des 2 especes

Absolute inclusive cross sections for $$\bar pp$$ interactions at 7.3 GeV/c are given. The data cover prong cross sections,V 0, γ production and inclusive charged particle (p/π) production. Separation has been made into annihilation and non-annihilation components. Inclusive π+, π− production in the processes of $$\bar pp$$ annihilation and non-annihilation are compared with simple quark models.

Description d’une nouvelle espece : Falcaustra tchadi (Kathlaniidae) parasite de Distichodus brevipinnis (Poisson Citharinidae), du Tchad. Ce Nematode se distingue des especes deja connues par les dimensions de ses spicules, la forme de son prebulbe et la longueur de la queue de la femelle.