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J M Corréas

Publications and source records attributed to J M Corréas.

8 recordsLinked to original sources
PubMed2003

[CT pelvimetry: a new approach using multi detector CT and volume rendering].

The authors describe a new technique of CT pelvimetry, using multi detector CT. This protocol is able to provide an anatomic view of the bony pelvis as well as classical measurements for pelvimetry. The acquisition is made using low technical parameters allowing the radiation dose to remain similar to that of conventional CT. Helical acquisition with thin slices and interleaved reconstruction provides adequate material for Volume Rendering reconstruction. Presets of the software may give readily available images within seconds, saving time for the radiologist. Although this technique might be performed using single slice helical CT, multi detector CT makes it faster and more accurate as the acquisition time is shorter. Final images are more easily understood by obstetricians and midwives, leading to a better understanding of dystocias. This anatomical information is obviously superior to that of conventional CT. Because it is simple to perform, has no medical time cost for the radiologist if a Volume Rendering software is available, and does not require additional radiation, we believe that this technique should replace conventional CT or conventional pelvimetry.

Female↗
PubMed2000

Dilated bile duct in patients receiving narcotic substitution: an early report.

Narcotic substitution is now widely used. Morphine can induce a spasm of the sphincter of Oddi but dilation of bile duct has been reported only in an anecdotal case. In June 1995, we observed a first case of dilation of the common bile duct without organic obstacle in a hepatitis C virus (HCV)-infected patient who was under narcotic substitution, suggesting a causal relationship. We conducted a prospective study to evaluate the precise prevalence of bile duct abnormalities related to narcotic substitution in active intravenous drug or ex-intravenous drug users referred to our liver unit for histologic evaluation of HCV infection. We conducted a prospective study in a 30-month period of 334 HCV-infected patients, including 36 receiving narcotic substitution with methadone or buprenorphine. Biliary tract was analyzed by ultrasonography and by endoscopy ultrasound in cases of bile duct abnormalities. Of the 36 patients under narcotic substitution, 3 (8.3%) had asymptomatic dilated bile duct without organic obstacle--defined as a common bile duct > or =9 mm--compared to 1 of 298 (0.03%; p < 0.001) of those who did not receive substitution. Narcotic substitution may lead to bile duct dilation that does not require invasive diagnosis procedures.

Adult↗
PubMed1998

Thickening of the wall of the bile duct due to intramural collaterals in three patients with portal vein thrombosis.

OBJECTIVE: We report three cases of a rare form of cavernoma developed within the wall of the common bile duct. CONCLUSION: To our knowledge, this kind of portal cavernoma has not been described in the literature. Because the cavernoma may be easily confused with other causes of bile duct wall thickening, color Doppler sonography is mandatory for a correct diagnosis.

Adult↗
PubMed1995

Inflammatory aneurysms of the abdominal aorta: CT findings.

Inflammatory aneurysm of the abdominal aorta (IAAA) is a variant of atherosclerotic aneurysm that is characterized by inflammatory and/or fibrotic changes in the periaortic regions of the retroperitoneum [1, 2]. These inflammatory and/or fibrotic changes are probably the result of a local autoallergic reaction to certain components of atherosclerotic plaques [2]. This distinct entity has important implications, as the periaortic fibrotic tissue adherent to ureters, the duodenum, and the inferior vena cava may complicate surgical repair [1, 2]. The purpose of this essay is to illustrate the CT appearance of IAAA, with emphasis on the identification of IAAA and differentiation from conventional aortic aneurysms, evaluation of the involvement of adjacent structures by the periaortic fibrosis, and evaluation of the retroperitoneum after aneurysmal repair to analyze the resolution or the persistence of the periaortic fibrosis.

Aorta, Abdominal↗
PubMed1994

[Imaging of vascular complications of renal transplantation].

The accuracy of color Doppler US (CDUS) for the detection of main renal transplant artery stenoses is excellent (Se 92%; SP 99%). Whereas the sensitivity of CDUS is still unsatisfactory for the detection of arterial branch stenosis (Se 70%), it has become higher than previously reported because of the ability of color flow images to identify hemodynamic changes at the site of stenosis and focal downstream repercussions in the case of tight stenosis. Color Doppler US is a valuable method in the detection of segmental infarction or large areas of cortical necrosis. However, small superficial cortical perfusion defects are usually undetectable by color Doppler. Contrast-enhanced MRI appears to be more accurate than color Doppler US; it is useful in confirming the diagnosis of infarction and detecting small infarcts missed by color Doppler US, and provides an accurate evaluation of the extent of the infarct; Spectral features (reflux during the whole diastole) obtained from renal arteries in case of acute renal vein thrombosis are suggestive but not specific since they can be observed in the case of severe acute rejection with cortical necrosis. Such findings associated with a lack of venous Doppler signals in the whole kidney are highly suggestive of renal transplant vein thrombosis. Post-biopsy arteriovenous fistulas and false arterial aneurysms are accurately detected by color Doppler Imaging. Color Doppler appears to be the primary Imaging modality for early detection of renal allograft vascular complications.(ABSTRACT TRUNCATED AT 250 WORDS)

Aneurysm↗
PubMed1994

[MRI in cancer of the prostate with T1-weighted sequences using fat suppression and injection of gadolinium].

The assessment of tumor extension in 20 patients with cancers of the prostate at a clinical stage A or B included MRI with a body coil before prostatectomy. Transverse and coronal T1-weighted sections with injections of gadopentate dimeglumine (gadolinium) and fat suppression were systematically taken to assess the vascularity of the various regions of the prostate and of the cancer, as well as the merits of such sequences for the assessment of extension. The normal, poorly vascularized peripheral area is only slightly enhanced by injection, while the transition area, which is most often hyperplastic in the age group studied, enhances heterogeneously with contrast. All cancers enhance after injection. In the assessment of extension, the major merit of gadolinium is that it allows exploration both of the vesiculodeferential junction on coronal sections and of the structure of the seminal vesicles. Thus a normal junction allows ruling out macroscopic invasion of the vesicles. In addition, gadolinium allows correcting false positive MRI findings when the areolar structure of the vesicles is preserved. Gadolinium does not provide additional evidence of extension through the capsule in comparison with T2-weighted sequences. On a whole, in our series, MRI with a body coil, associated T2-weighted sequences and T1-weighted sequences after gadolinium injection and fat suppression, has 58% sensitivity and 100% specificity for the diagnosis of stage C cancers.

Aged↗