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Biomedical subjects

A Dop

Publications and source records attributed to A Dop.

11 recordsLinked to original sources
PubMed1977

CT studies of tumors of the skull base, facial skeleton and nasopharynx.

Fifty cases of tumors of the base of the skull, facial skeleton and nasopharynx were studied by CT. The tumoral densities were measured and compared to the pterygoid muscle density which was used as reference. Results showed no relationship between tumoral density and histology, and intravenous contrast medium injection was not useful. CT, however, does offer many advantages in the diagnosis of nasopharynx tumors, (5 cases) and in the determination of the extension of facial skeleton tumors.

Humans↗
PubMed1977

Cerebral ischemia with CT.

One hundred fifty-eight patients with cerebral ischemia, and divided into four clinical groups were studied with CT. The results were correlated with those of angiography, scintigraphy and regional cerebral blood flow measurement. CT evolution was closely correlated with clinical and anatomical evolution. Changes in cerebral parenchyma density, in relation to the ischemic lesion, are the result of two phenomena: first, edema showing a fairly stable peak of intensity in the 2nd week and disappearing totally before the 20th day; and second, necrosis, variable in extent from patient to patient at the onset with subsequent evolution towards cavitation and thus a density similar to that of cerebro-spinal fluid.

Adolescent↗
PubMed1977

Cerebral metastasis--a study of computerized tomography.

Sixty-eight cases of metastases affecting 34 patients were studied by computerized tomography (CT) before and after the injection of an iodinated contrast medium. CT data provided a diagnosis in most cases. After injection of the contrast medium, a ring aspect was found in half the cases. This morphological feature is a sign of blood-brain barrier impairment crossed by the contrast medium. The low density area inside the ring is not caused by central necrosis, nor is it caused by too little contrast medium. The increase in density is a sign of extra-vascular loss of iodinated molecules in the peritumoral cerebral tissue. Performance of CT should be improved using specific tracers of the tumoral cells.

Brain Neoplasms↗
PubMed1976

[Evolutive aspects of cerebral vascular complications. Tomodensitometric study].

Seventy patients with clinical evidence of cerebral vascular accidents were studied by tomodensitometry. Forty-eight had clinical signs of acute ischaemia and, by means of 64 investigations, it was possible to follow the development of focal softening. Diagnostic difficulties encountered in the course of the first fortnight of development are described. Twenty-two patients exhibited clinical symptoms of meningeal or cerebro-meningeal haemorrhage. Eighteen haematomas were diagnosed and their development studied in 34 investigations.

Cerebral Hemorrhage↗