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Biomedical subjects

P Linhart

Publications and source records attributed to P Linhart.

At least 19 recordsLinked to original sources
PubMed1998

[Ultrasound in diagnosis of benign and malignant liver tumors].

Sonography has a high sensitivity in diagnosing circumscript lesions in the liver when modern machines are used by a skilled examiner. The exact analysis of the sonographic imaging characteristics allows definite diagnosis in the majority of cases. The high prevalence of benign liver tumors has to be considered. It is substantiated by an evaluation of 731 own patients. The characteristics of the most important circumscribed liver lesions are presented and suggestions for the diagnostic work-up are provided.

Diagnosis, Differential↗
PubMed1993

[What is the onset of primary biliary liver cirrhosis?].

The medical records of 49 consecutive patients with primary biliary cirrhosis of the liver were screened for informations about medical examinations during the years before the diagnosis was established. In 15 cases previous medical reports could be found. Evidence of liver disease (slight elevation of transaminases and gamma-GT) was documented up to 18 years before the diagnosis was proven. In 6 patients liver biopsies had been performed: normal 1 x, fatty liver 1 x, fibrosis 1 x, non-specific hepatitis 1 x, chron. pers. Hep. 2 x. The characteristic increase of alkaline phosphatase often occurred within a few months. Antimitochondrial antibodies became positive independent of the beginning of cholestasis. It can be concluded that early stage primary biliary cirrhosis must be considered in patients with long standing slight elevation of liver enzymes even without cholestasis when other causes can be excluded.

Adult↗
PubMed1989

Three other types of duodenal polyps: mucosal cysts, focal foveolar hyperplasia, and hyperplastic polyp originating from islands of gastric mucosa.

Seven cases are reported that initially presented on endoscopic examination as duodenal polyps originating from islands of gastric mucosa within the duodenal bulb. Microscopic examination revealed mucosal cysts (MC), focal foveolar hyperplasia (FFH), and hyperplastic polyp (HPP). These lesions must be added to the list of neoplastic and tumorlike lesions of the duodenum that may endoscopically present as polyps.

Aged↗
PubMed1986

[Splenomegaly].

Explore the source record for details and available documents.

Humans↗
PubMed1986

[Sonographic determination of spleen size: normal dimensions in adults with a healthy spleen].

Sonography can rapidly and reliably help to determine the size by the spleen. To standardise the sonographic dimensions of the healthy spleen, we effected sonographic examination of 793 female and male patients aged between 17 and 82 years with a healthy spleen. In 95% of the patients the length of the spleen was less than 11 cm, the breadth below 7 cm and the thickness less than 5 cm. The weight of the spleen as determined via the rotation ellipsoid formula was below 190 g in 95% of the patients. Whether or not a spleen larger than standard signals an acute disease can be clinically assessed only on the basis of a synopsis of all findings.

Adolescent↗
PubMed1985

[Qualification and quality control in sonography].

On the basis of guidelines issued by the Kassenärztliche Vereingung Hessen, some criteria for the application of sonographic examinations are presented. Minimal requirements for sonographic equipment in certain specialties are mentioned, and it is pointed out how not only case history and clinical examination but also one's own sonographic evidence are important for a accurate sonographic diagnosis.

Abdomen↗
PubMed1985

A pseudolesion of the liver caused by rib cartilage in B-mode ultrasonography.

An artifactual protuberance at the surface of the liver in connection with an incomplete acoustic shadow is described. The reproduction of these phenomena in vitro was possible, providing an explanation of their origin. Rib cartilage, with its convex shape, and with the higher sound wave velocity and the higher attenuation compared with the surrounding tissue, causes these artifacts. The identification of a pseudolesion composed of these artifacts is simple if one considers its origin.

Acoustics↗
PubMed1984

[Double images in B-mode sonography due to acoustic dispersion lenses].

Clinical observations revealed that duplication artifacts in B-mode-ultrasound depend on rib cartilage in the sound field. The in-vivo conditions were imitated by watertank experiments with an acrylic glass magnifier which has the properties of an acoustic dispersing lens. With this the duplication artifacts proved to be caused by acoustic dispersing lenses, in-vivo due to rib cartilage, for example.

Cartilage↗
PubMed1984

[Sonographic determination of spleen size and spleen weight].

This report deals with the results of post-mortem sonographic examination of the spleen of 36 patients. The goal of the study was to gain direct information on the precision of the sonographic organometric method we use. It becomes evident that - depending on the position of the spleen in the dome of the diaphragm - the real length of the organ is underestimated when it is measured as the direct line between the two poles. For this reason the length should be taken as the (curved) median line obtained when performing a longitudinal section of the spleen at sonography. Under these conditions there is a good correlation of the sonographic and anatomic data obtained by autopsy. The mean deviation is maximally 7 mm. For the approximate calculation of the organ weight from the sonographically obtained data the simple ellipsoid formula is sufficient. In order to obtain a normogram for sonographic weight estimation a larger statistical sample is necessary.

Humans↗
PubMed1984

[Clinical importance of routine sonographic studies in gynecology].

In a prospective study, the authors screened a total of 2.070 patients. Of these, 213 showed unexpected sonographic findings. 96 of these patients were women. Gynaecological diseases or changes in the minor pelvis were least represented. This proportion is so small that routine sonography does not appear worth while as far as gynaecology is concerned. For, if we take the incidence of adnexal tumours into account, relevant chance findings can be expected in only 2.8 cases out of one million, which makes the screening process uneconomical.

Adult↗
PubMed1984

Acoustic dispersing lenses cause artifactual discontinuities in B-mode ultrasonograms.

Artifacts as disruptions and duplications of the diaphragm, gallbladder wall, posterior wall of the left ventricle, etc., are often seen in B-mode ultrasound examinations. To identify their cause, in vitro experiments were carried out. These investigations showed that these artifacts are caused by acoustic dispersing lenses. In vivo they are due to rib cartilage and in vitro they can be reproduced by introducing an acryl lens into the sound field.

Cartilage↗