[Liver and focal liver contrast: radiologic-pathologic correlation]. / Foie et contraste des lésions focales: corrélation radio-histologique.

Knowledge of the histological features of different components of a liver lesion greatly assists radiologists because it provides understanding of the correspondingimaging features. The imaging characteristics of lesions depend on variations of the extracellular architecture, mainly surrounding stromal tissue. Until histological imaging techniques become available, cellular analysis relies on optical microscopy and immunohistochemistry. Recent advances in imaging techniques now provide additional information on lesions due to improved spatial, temporal and contrast resolution. Correct interpretation of these imaging features should improve diagnosis.

[New possibilities to study biliary tree and gallbladder: functional magnetic resonance cholangiography contrast-enhanced with mangafodipir trisodium (Mn DPDP)]. / Les nouvelles possibilités d'exploration des voies biliaires en IRM: de l'imagerie morphologique à l'imagerie fonctionnelle avec perfusion de Mangafodipir Trisodium (Mn DPDP).

Mangafodipir trisodium (Teslascan) is a hepatobiliary contrast agent that provides noninvasive opacification of the bile ducts. Using this contrast medium combined with a T1-weighted gradient echo enhanced sequence provides functional imaging of the bile ducts. Second-intention MRI was obtained after the usual morphological study of the bile ducts using heavily T2-weighted sequences (SS-FSE Te eff long and SS FSE Te eff short). This method can detect many biliary duct anomalies: biliary leakage in the postoperative context, mapping of bile ducts and the gallbladder in the search for anatomical variants, analysis of biliodigestive or biliobiliary anastomoses, or a dynamic study of bile secretion and excretion. Opacification of the bile ducts has only been possible until now with invasive tests aggravated by a certain co-morbidity rate and their functional study using biliary scintigraphy limited by mediocre spatial resolution. This new possibility provides access not only to morphological imaging, but also to functional imaging with excellent spatial resolution.

[CT enteroclysis: a pictorial essay]. / L'enteroscanner: revue iconographique.

The objective of the CT-enteroclysis is to distend the entire small intestine equally and sufficiently using a nasojejunal probe and an enteroclysis catheter for administration of a neutral opacifying agent. Today this is the best radiological method available to explore the small intestine because of its good spatial resolution and the rapidity of the exam. It is a high-performance exam when searching for transmural and extramural pathologies, in particular small tumoral lesions. It remains less effective in the exploration of anomalies of the lumen's mucosal lining, contrary to videocapsule endoscopy and the double-balloon enteroscope. It has been recognized that the CT-enteroclysis is a high-performance examination that should replace the small-bowel follow-through exam. However, there are undeniable disadvantages: higher does of radiation, patient discomfort during placement of the enteroclysis catheter, false-positive results, long interpretation time, and the impossibility of exploring the endoluminal aspect of the intestinal mucosal lining. All radiologists should therefore become familiar with the problems involved with this exam and its signs and patterns, which are illustrated in this pictorial review.

[Pulmonary artery sarcoma during postpartum: CT findings]. / Sarcome de l'artère pulmonaire dans le post-partum: aspects scanographiques.

We report the case of a 28 year-old female, who gave birth seven weeks previously, presenting with a pulmonary artery leiomyosarcoma discovered on a thoracic CT performed for clinical suspicion of pulmonary embolism. This case presents two major points of interest: on the first hand, it is a particular context (young post-partum patient), with classic symptoms of routine pulmonary embolism. On the other hand, the exam clearly demonstrates tumor enhancement, which is characteristic but rarely described.

[Contribution of EKG-gated multislice CT in the diagnosis of arrhythmogenic right ventricle dysplasia: report of two selected cases]. / Apport du scanner volumique avec synchronisation ECG dans le diagnostic de cardiomyopathie arythmogène du ventricule droit: à propos de deux cas choisis.

Arrhythmogenic cardiomyopathy of the right ventricle is characterized by replacement of right myocardial cells by fibro-fatty tissue and arrhythmias. The authors present two cases where EKG gated multislice CT was valuable. In one case, comprehensive evaluation of extensive ventricular dysplasia complicated by intraventricular thrombus was achieved whereas accurate evaluation of the ventricular wall process was possible in another case.

[Imaging of complications of Meckel diverticulum]. / Imagerie des complications du diverticule de Meckel.

Meckel's diverticulum is a persistent embryonic remnant occurring in 2% of the general population. As an "ileal appendix", it is usually clinically silent and only discovered at the time of complications: inflammation, hemorrhage, obstruction, tumor. The preoperative diagnosis is rarely made because of the non specific nature of the symptomatology and only about 10% of complicated cases are diagnosed at imaging. Complications from Meckel's diverticulum should always be considered in patients presenting with an acute abdomen, especially in young adults.

[Secondary diseases of the peritoneum]. / Le péritoine << témoin >> de la pathologie abdomino-pelvienne.

Most inflammatory, infectious or tumoral diseases of the bowel and abdominal organs may secondarily involve the peritoneum which acts as a mirror of the diseases. Multidetector CT allows breathhold acquisitions through the abdomen and pelvis providing high spatial and contrast resolution imaging at all phases of contrast distribution as well as MPR and 3D capabilities.

[The gallstone ileus: key points and traps of diagnosis with sliced pictures]. / L'iléus biliaire: points clés et pièges du diagnostic par l'imagerie en coupes.

Twenty-five per cent of obstructions in patients 70 years and over could be caused by gallstone ileus. Due to the variable clinical symptomatology, diagnosis can be delayed and results in poorer outcome than expected for this benign pathology. Early CT evaluation improves the accuracy of diagnosis. Based on a review of twelve cases, the typical imaging features and pitfalls will be reviewed.

[Small bowel obstruction caused by enteroliths and Meckel's diverticulitis associated with internal paracecal hernia in an adult]. / Occlusion par entérolithe et diverticulite de Meckel associée à une hernie interne paracaecale chez un adulte.

The Authors report a rare case of Meckel's diverticulum complicated by diverticulitis and a small bowel obstruction due to enteroliths, associated to a paracecal internal hernia. Computed tomography was useful for surgical planning.