Localized modulation of rotating waves in Taylor-Couette flow.

We report the results of an experimental study on the multiplicity of states in Taylor-Couette flow as a result of axial localization of azimuthally rotating waves. Localized states have been found to appear hysteretically from time-dependent Taylor-Couette flow at Reynolds numbers significantly above the onset of wavy Taylor vortices. These localized states have the shape of a modulated rotating wave and differ significantly from global modulated wavy Taylor vortex states in their spatial characteristics.

[Can pharmaco-DSA of the kidney replace intraoperative rapid biopsy diagnosis?].

Question: Can primary nephrectomy be performed without preliminary sample excision of the tumor if pharmaco-angiography of the kidney has demonstrated the typical tumor vascularization?

Material And Method: To clarify this question in 32 patients with "displacing mass" of the kidney, verified in sonography and computer-tomography, or hematuria of unknown origin, we prospectively performed and additional pharmaco-angiography of the respective kidney.

Results: In 18 patients with tumor vascularization in the pharmaco-angiography, intraoperatively we found 15 malignant renal cell carcinomas, 1 patient with transitional cell carcinoma of the renal pelvis, 1 leiomyosarcoma, and 1 high-differentiated tumor of only 2 cm in diameter with unclear dignity, which was treated by enucleation.

Conclusion: In case of an intrarenal lesion of more than 3 cm in diameter and additional tumor vascularization seen in selective pharmaco-angiography, the kidney undoubtedly can be removed by primary nephrectomy without a preliminary sample excision to confirm the diagnosis.

[Results of selective kidney DSA in suspicious computerized tomography findings--retrospective evaluation of 122 cases].

The superiority of computer tomography in the detection and staging of renal malignomas has been proven in numerous studies. In this retrospective analysis, the significance of the pre-surgically still widely and routinely performed, selective kidney angiography was investigated. The written computer tomographical and angiographic findings of 122 patients were classified according to malignancy stage urgency.

[A combination of conventional single contrast arthrography with arthro-CT of the shoulder--an evaluation of 78 cases].

For the diagnosis of traumatic shoulder lesions, 78 patients have been examined by conventional single contrast arthrography with subsequent CT. For 26 patients, it was possible to compare the radiological diagnosis with the arthroscopic or surgical findings. The combination of both diagnostic methods provided a high sensitivity (94%) and specificity (100%) for lesions of the ventral or dorsal limbus.

[The end stage of a rheumatoid arthritis presenting as a tumorous space-occupying lesion of the left axilla].

In this paper we report on a 67-year old woman suffering from long-term rheumatoid arthritis. She was admitted to hospital because of a hard tumour with the size of a fist in her left axilla. The supposed tumour was proved by conventional radiological and CT examination as an excessive manifestation of the basic disease in the left shoulder joint.

[A large asymptomatic renal hemangioma as a chance radiologic finding].

The author reports on a large asymptomatic renal haemangioma that was found accidentally in the course of a preoperative CT examination. The radiological visualisation in plain CT, in serial CT as well as in selective angiography is presented. The finding is discussed and compared with the observations reported so far in the literature in respect of this rare benign tumour.

[Chordoma as osteolytic space-occupying lesion of the anterior lumbar spine].

A case of a 78-year old woman with a chordoma destroying the second lumbal vertebra is reported. Radiologic and histologic feature of this rarely diagnosed tumor is demonstrated. An overview about the therapeutic modalities is given.

[Post-traumatic hematoma simulating a left-sided adrenal gland tumor].

Typical signs of posttraumatic adrenal gland haematoma in computer-tomography are, besides an enlargement of the adrenal gland, a stripy infiltration of surrounding tissue and a thickening of the homolateral crus of the diaphragma, located primarily in the right adrenal gland. We report a case of an isolated enlargement of the left adrenal gland with normal surrounding tissue, which histologically proved to be a posttraumatic hematoma within the adrenal gland medulla.

[Quantitative serial computed tomography. Kidney and tumors].

Density-time-functions after intravenous contrast medium injections are simultaneously taken by a computer tomograph in the region of the aorta and the cortex of the kidney or the region of the aorta and a tumor respectively. The differential equation system resulting from this is solved explicitly on the basis of a compartment model. The resulting functions are related to the density-time functions.

Automated measurements of cerebral atrophy in multiple sclerosis.

An automated method of measuring cerebral atrophy is introduced. Using this method we studied patients with multiple sclerosis and a control group showing premature cerebral atrophy in multiple sclerosis (P = 1,32 x 10(-8) for male and P = 3,6 x 10(-14) for female). There was only a weak correlation between cerebral atrophy and psychological deficits.

[Spongiocytic adenoma of the adrenal cortex--risk of misinterpretation as a cyst in computerized tomography].

A report on two cases where solid benign tumours of the adrenals (spongiocytic adrenocortical adenomas) were misinterpreted as adrenal cysts due to water-equivalent density values. The CT scans are compared with the microscopic cuts.

Combination of 5-fluoro-uracil and Co60 irradiation in the treatment of carcinoma of the oro-facial region. A follow-up investigation of 30 patients.

During the years from 1974 to 1977, 30 patients were treated for carcinoma of the oro-facial region with a combination of 5-fluoro-uracil and telecobalt under the care of the Institute of Radiotherapy, Knappschafts-Krankenhaus, Recklinghausen. 13 of these patients were inoperable and had primary irradiation therapy, and the remaining 17 patients were irradiated postoperatively. The main effect that treatment showed was a rapid response in the inoperable tumors, while the 4- to 5-year survival rates of 1:13 of the inoperable cases and 6:17 of the operated patients are in accordance with generally accepted results.

[Five-year recovery of case of carcinomas of the uterus after conventional irradiation and after telecobalt therapy (author's transl)].

Two part collectives of patients with carcinomas of the uterus - one consisting of 525 conventionally irradiated patients, the other consisting of 577 patients irradiated with telecobalt - are compared with respect to their five-year survival recovery rate, the frequency of recurrences and metastases and the radiogenic complications. After having introduced the telecobalt therapy - intracavitary radium therapy remaining unchanged - the five-year survival recovery ameliorated by about 10% for carcinomas of the cervix as well as for carcinomas of the body of the uterus. The evaluation according to tumor stages showed that the telecobalt irradiation was particularly advantageous for operated and non-operated patients with a carcinoma of the cervix of stage II as well as for non-operated patients with a carcinoma of the body of the uterus.

[The value of CT in the differential diagnostic evaluation of masses in the left upper abdominal quadrant (author's transl)].

Analysis of criteria used in the evaluation of left upper abdominal masses seen on CT. A very critical approach is recommended concerning the diagnostic reliability of density measurements and contrast-enhancement. The configuration of the mass and its relationship to the neighborhood seem to be more important aids for a reasonable differential diagnosis.

[Explorative laparotomy combined with splenectomy in malignant lymphomas (evaluation of 52 medical records) (author's transl)].

52 medical records of patients with malignant lymphomas, who had been treated by explorative laparotomy and splenectomy, were evaluated retrospectively. In all patients lymphography and splenic scintigraphy had been performed prior to surgical treatment, and in most of them additional liver scintigraphy. The splenic scintigram was true-positive in 11 cases, false-positive in 6, false-negative in 8, and true-negative in 27 cases.