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Biomedical subjects

G Cosnard

Publications and source records attributed to G Cosnard.

At least 91 records · Page 5Linked to original sources
PubMed1987

[Hematomas and MRI at 0.15 T. Apropos of 100 cases].

One hundred hematomas were examined by magnetic resonance imaging (MRI) at 0.15 T, all explored in SEpT1 and most in SEpT2. The number of cases examined in the acute phase during the first 48 hours was low: 8 cases. At this SEpT1 period the hematoma appears of elevated signal with good muscle contrast but without contrast in hepatic and cerebral parenchyma. In a weighted T2 sequence, the intense signals of cerebral edema and plasma or serum enables detection of the encephalic lesion. Findings from 68 hematomas observed in the subacute or chronic phase suggest that their appearance is pathognomonic with visualization in SEpT1 of a crown of an intense signal at least equal to that of fat. The only difficulty at this period is the discovery of a hematoma within the fat: orbital, retroperitoneal... The collection of a subdural hematoma usually appears homogeneous, the intensity of the signal varying with red cell concentration and time. In the soft tissues, the intensity of signal is a function of concentration of hemoglobin and its derivatives and of volume of serous effusion. Images of 24 hematomas during the sequelae phase confirmed the appearance of a "biochemical shell" without signal in SEpT2 and allowed detection of the hematic contents of an occupying process even after long periods, sometimes after one year.

Adolescent↗
PubMed1987

[Inter-apophyseal articular synovial cyst of the lumbar spine. X-ray computed tomographic and magnetic resonance imaging correlation. Apropos of 2 cases].

Two patients presenting with L5 radiculagia were investigated by CT scan imaging. The origin of the pain was determined with certitude as arising from intraspinal development of an interapophyseal synovial cyst. Examination of the two cases by MR imaging provided conflicting results: in one patient images obtained by MR were not contributive and the synovial cyst would probably have been missed while in the other patient images were specific and very sensitive for diagnosis of interapophyseal synovial lesions. Treatment was surgical in both cases.

Female↗
PubMed1986

[Delayed, triangular, hyperdense, computed x-ray tomography images of the renal parenchyma following iodide injection. Interpretation of transient renal ischemia?].

Three cases of renal ischemia diagnosed by Computed Tomography (CT) are presented. The pathophysiology of renal ischemia which accounts for the CT findings observer in these cases are reviewed. In the appropriate climate setting a diagnosis of renal ischemia may be made by CT, when a zone or zones of low attenuation after injection and enhancement of these same zones 6 to 72 hours later are observed in the kidney.

Adult↗
PubMed1985

[Magnetic resonance imaging of the head compared with the CT scan].

After the description of the normal head anatomy in MRI and its exploration plans, the images observed in benign and malignant tumours of the brain, in cerebral ischaemic attacks, in the diseases of the orbit, face and skull base, are considered. The limits and present indications of the technique are defined.

Brain↗
PubMed1985

[Diagnosis of renal, peri- and para-renal infections. Contribution of ultrasonics and x-ray computed tomography. Apropos of 10 cases].

Principal signs and symptoms of renal parenchyma infections are discussed in relation to findings in 10 cases. Disorders studied were acute pyelonephritis and focal and bacterial acute nephritis, renal abscess and perinephritic phlegmon. Intravenous urography was only moderately sensitive (4/7) and of little specificity. Ultrasound imaging showed much greater sensitivity (8/10), undetected lesions being the earliest cases of severe acute pyelonephritis. The scanner was the most sensitive investigatory method since it associated anatomical and functional aspects in data obtained, justifying its initial use for certain authors.

Abscess↗
PubMed1985

[X-ray computed tomographic detection of foraminal neurinoma. Apropos of a case].

About the case of the vertebral neurilemmoma diagnosed at the very beginning, purely inside the foramen, precursor of the classical "hourglass Tumor", the authors remain the clinical evolution and the anatomy of the intervertebral foramen's neurilemmoma. They insist on the insufficiency of the conventional radiology in early diagnosis. They also exposed the C.T. technic and his results; the neurilemmoma can be diagnosed before his extension over the limits of the intervertebral foramen, but only if a precis neurological level is known.

Female↗
PubMed1984

[Comparative study of computed x-ray tomography and saccoradiculography in the diagnosis of early lumbar disk herniation. Apropos of 50 surgically-proven cases].

Comparison of diagnostic accuracy using the two methods showed scanner imaging to provide superior results, with confirmation of herniated disc in 90 p. 100 cases based on purely discal semiological features. Limitations of the method result from the absence of epidural fat (narrow lumbar canals). A new hierarchy of radiological explorations in resistant lumbosciatica is proposed.

Back Pain↗
PubMed1981

[Trapped popliteal artery. Early diagnosis by dynamic tests during arteriography (author's transl)].

An extrinsic functional stenosis was detected in the contralateral popliteal artery during follow-up arteriography in a patient operated upon for a thrombosed trapped popliteal artery. The value of dynamic tests of plantar flexion against resistance with the knee extended, in a conscious patient, is stressed. A recently available contrast medium enables arteriography of the lower limbs to be conducted without a general anaesthetic. Since writing this report, the authors have explored a type II bilateral form of trapped popliteal artery in a 35-year-old man, in whom the diagnosis was determined mainly from dynamic films.

Constriction, Pathologic↗