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Biomedical subjects

C Chagnaud

Publications and source records attributed to C Chagnaud.

43 records · Page 3Linked to original sources
PubMed1990

[Preoperative staging of central bronchopulmonary cancer. X-ray CT-MRI-pulmonary digital subtraction angiography and surgery].

In order to evaluate the reliability of medical imaging methods in the assessment of mediastinal invasion by lung cancers, a prospective study was conducted in 30 patients undergoing preoperative computed tomography (CT), magnetic resonance imaging (MRI) and pulmonary digital subtraction angiography. MRI improved the sensitivity of detection of surgically confirmed mediastinal lymphadenopathy, but its specificity in relation to histological results was poor and identical to that of CT. In terms of extension to vascular structures, MRI and CT gave comparable results for the pulmonary artery and vein with two false positives for the pulmonary veins and left atrium with the two methods. MRI was found to be superior to CT for the detection of invasion of the aortic arch. Digital subtraction angiography is not as reliable as the other two modalities, particularly for extension to the pulmonary vein for which it was found to be technically inappropriate. By means of sagittal and frontal scans, MRI was therefore found to be more effective than CT for examination of the subcarinal region and aorto-pulmonary window. In contrast, the persistence of false positives with the two methods and the impossibility of distinguishing between inflammatory lymph nodes and neoplastic lymph nodes means that thoracotomy can never be contraindicated on the basis of the results of imaging alone.

Aged↗
PubMedDate not supplied

Imaging of fat thrombus in the inferior vena cava originating from an angiomyolipoma.

A rare case of fat thrombus in the inferior vena cava originating from an angiomyolipoma is reported. Diagnostic imaging including ultrasonography, CT, MRI, and cavography was performed preoperatively. MRI allowed the most complete preoperative staging because of specific fatty signal intensity and good assessment of renal vein involvement.

Adult↗
PubMedDate not supplied

Percutaneous retrieval of a Strecker stent misplaced during TIPS.

During a transjugular intrahepatic portosystemic shunt (TIPS) procedure, a Strecker stent was accidently pushed into the superior mesenteric vein. After successful shunt placement, the stent was withdrawn into the hepatic vein. A multipurpose basket catheter was attached to the distal end of the stent and a loop snare to the proximal end. In this way it was possible to stretch the stent and retrieve it percutaneously through the jugular sheath.

Female↗
PubMedDate not supplied

Juvenile nasopharyngeal angiofibroma: comparison of blood loss during removal in embolized group versus nonembolized group.

PURPOSE: This retrospective study was performed to assess the beneficial effect of preoperative embolization of juvenile nasopharyngeal angiofibromas (JNA) in terms of blood loss during surgery. METHODS: Intraoperative blood loss in a group of 7 patients who underwent 10 procedures for JNA without preoperative embolization was compared with the blood loss of 13 patients who underwent 16 procedures after embolization of one or both external carotid arteries. RESULTS: Mean blood loss was 5380 ml in patients without embolization and 1037.5 ml in those with embolization. This difference was not statistically significant because of the high standard deviation in the nonembolized group. However, when data were analyzed by tumor stage, a significant difference was noted between the embolized and the nonembolized patients with high-grade tumors but not between those with low-grade tumors. CONCLUSION: Preoperative embolization of the branches of the external carotid appears to facilitate removal of high grade tumors. The benefit of embolization in those with low-grade tumors is less clear cut, probably because there is less vascularity in low-grade tumors and so removal is easier.

Adolescent↗
PubMedDate not supplied

TIPS for portal decompression to allow palliative treatment of adenocarcinoma of the esophagus.

We describe a case in which a transjugular intrahepatic portosystemic shunt (TIPS) was inserted to enable palliative treatment of an adenocarcinoma of the esophagus. The cirrhotic patient presented with esophageal varices in contact with a tumor of the esophagus. By relieving portal pressure, TIPS reduced the risk of hemorrhage during laser resection and prevented recurrence of esophageal varices.

Adenocarcinoma↗
PubMedDate not supplied

[Imaging of paranasal sinus trauma].

UNLABELLED: The role of imaging in the management of maxillofacial trauma is to describe anatomical lesions and to detect complications and associated injuries. Plain films are still useful for minimal trauma, but CT-scan is the gold standard for complex trauma. Helical CT and multidetector row CT simplify the emergency imaging of horizontal struts (skull base, orbital floor, alveolar ridge and palate). The diagnosis, and sometimes the treatment of complications may require CT cisternography, MRI and angiography. LEARNING OBJECTIVES: review mechanisms and classification of paranasal sinuses trauma; present the imaging techniques with special emphasis on CT; describe paranasal sinuses trauma features and pseudo-fracture patterns; describe complications and associated injuries.

Facial Bones↗