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Biomedical subjects

D Vadrot

Publications and source records attributed to D Vadrot.

61 records · Page 4Linked to original sources
PubMedDate not supplied

Aortic anastomotic pseudoaneurysms: US, CT, MR, and angiography.

Correlation of imaging and anatomic findings in seven men with abdominal aortic graft prostheses (four "end-to-end" anastomoses and three "end-to-side" anastomoses) was done to compare the value of different imaging modalities in detecting postoperative complications, especially aortic anastomotic pseudoaneurysms (AAPs). In all cases, angiographic and CT studies were carried out. In six patients ultrasound and MR examinations were also performed. Anatomic verification was obtained by surgery in six patients and autopsy in one case. Five patients had an AAP (four at surgery and one at autopsy), one had a true abdominal aortic aneurysm above the anastomosis, and one a nondetectable abnormality of the aortic suture line. Digital subtraction angiography diagnosed one of five AAPs, missed the true aneurysm in the sixth patient, and was normal in the patient without any aneurysm. Computed tomography correctly diagnosed the five AAPs and the true aneurysm and was normal in the last patient. Ultrasound correctly diagnosed the AAPs in three of four patients, incorrectly diagnosed an AAP in the patient who had the true aneurysm, and was normal in the patient without any aneurysm. Magnetic resonance diagnosed four of four AAPs and the true aneurysm and was normal in the last patient. Computed tomography seems to be the best imaging modality with which to diagnose and evaluate an aortic AAP in patients with aortoiliofemoral graft prosthesis.

Aged↗
PubMedDate not supplied

[Comparison of different methods of medical images in the assessment of local extension of osteogenic sarcomas].

The authors compared different methods of medical visualisation (standard radiography, arteriography, quantitative isotope bone scan, telethermography, CT scan, visualisation by nuclear magnetic resonance) in 52 osteogenic sarcomas. In the majority of cases the diagnosis was suggested by standard X-rays at the first visit. CT scan and visualisation by nuclear magnetic resonance are the two basic examinations both in terms of assessing the future single block excision as well as deciding the approach to be used for biopsy. Telethermography and quantitative isotope bone scan usefully complement clinical examination and standard X-rays in following the course during chemotherapy. Arteriography is indicated only in the presence of large tumors threatening the vessels directly.

Adolescent↗
PubMedDate not supplied

[Echotomography in the study of abdominal lymphadenopathies. Technique of examination and typical appearances (author's transl)].

Lymphographic opacification of the abdominal nodes is only partial, and it is therefore useful to have available another examination for the diagnosis of lymphadenopathies. Echography would seem to merit an important role since out of a series of 100 patients, it led to a positive and confirmed diagnosis in 78% of cases with 22% of errors, including 4% of false positives. In almost 20% of cases, echography gave additional information to that of lymphography, this justifying the simultaneous application of both examinations, either diagnostically or in the context of the surveillance of treatment. Lymphadenopathies are regularly visible from a diameter of 3 cm upwards, their structure is generally very slightly echogenic only and they may be perfectly precisely located. Problems of differential diagnosis are minimal if the technique is applied carefully, by contrast the appearance of lymphadenopathies is very similar and offers no indication as to the aetiology.

Abdomen↗
PubMedDate not supplied

[Pulmonary embolism. The role of computed tomography angiography].

NONINVASIVE PROCEDURE: Helical CT angiography is a noninvasive procedure whose only relative contraindications are renal insufficiency and iodine allergy. MASSIVE PULMONARY EMBOLISM: If a massive pulmonary embolism is suspected, helical CT angiography is the examination of choice because of its high accuracy in detecting proximal thrombi and its safety profile. NON-MASSIVE PULMONARY EMBOLISM: If a non massive pulmonary embolism is suspected, helical CT angiography, because of its high specificity, can be the first examination instead of scintigraphy. If a thrombus is depicted by CT, the diagnosis of pulmonary embolism is confirmed and treatment is started. If no thrombus is visualized by CT, pulmonary embolism can be ruled out in most cases. In case of doubt, another noninvasive procedure should be performed. Angiography should be the exception and seldom is needed.

Angiography↗