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Biomedical subjects

C Düber

Publications and source records attributed to C Düber.

At least 109 records · Page 6Linked to original sources
PubMed1991

[Obstructive jaundice: its histological diagnosis by percutaneous endoluminal bile duct biopsy].

32 forceps biopsies were performed in 30 patients with obstructive jaundice during percutaneous transhepatic biliary drainage procedures. In one patient an adequate specimen could not be obtained. In 25 of the remaining 31 cases diagnosis was confirmed histologically (malignant tumours: n = 22, benign stricture: n = 3). In 6 patients false-negative results were obtained. Transluminal biopsy is an easily performed adjunct to percutaneous transhepatic diagnostic interventions with minimal additional discomfort for the patient. In many cases percutaneous needle biopsy can be avoided. Forceps biopsy enables nonoperative histological diagnosis of small carcinomas of the bile ducts.

Adult↗
PubMed1990

[Cervical lymph node metastases: a histologically controlled comparison of palpation, sonography and computed tomography].

Sonography and CT were used pre-operatively for lymph node staging in patients with head and neck malignancies. The accuracy of the imaging methods surpassed that of palpation (palpation 85%, CT 85%, sonography 90%). Sensitivity was significantly increased from 74% (palpation) to 84% (CT) and 90% (sonography), ie. there was a reduction in false negative findings. Size of lymph nodes was not closely correlated with metastatic involvement. Reactively enlarged lymph nodes were more easily defined by CT and sonography than by palpation. This reduced the specificity of sonography (90%) and of CT (86%) compared to palpation (94%).

Carcinoma, Squamous Cell↗
PubMed1989

[Angioplasty of the subclavian artery. The technic, early and late results].

Percutaneous transluminal angioplasty (PTA) was performed in 22 patients (13 women and nine men; mean age 57 years [44-74] ) with symptomatic obstruction of the subclavian artery which was due to arteriosclerotic stenosis in 14, occlusion in six patients, radiogenic multiple stenoses in one (after radiotherapy for breast cancer), and stenoses of the left and right subclavian artery in one patient with Takayasu's arteritis. Primary success occurred in 21 (91%). The only complication was a stenosis of the brachial artery after combined brachiofemoral recanalization of a subclavian artery occlusion, but it did not require treatment. No emboli were noted. A good long-term result was achieved in 19 of the 21 primarily successful PTAs, in two instances after repeat PTA. PTA has thus been shown to be a simple, well tolerated interventional treatment of symptomatic subclavian obstruction with a high success rate and low risk of complications. It is to be preferred as a primary procedure to surgical intervention.

Aged↗
PubMed1989

[The place of bone scintigraphy in the diagnosis and follow-up of Ewing's sarcoma].

The radiological and scintigraphic findings of 26 patients with histologically proven Ewing's sarcoma were analysed. Three-phase bone scan should be done early in patients presenting with pain and normal radiographs. Perfusion and metabolism of a bone lesion can be assessed by skeletal scintigraphy. Bone metastases are first seen on bone scan. In the follow-up of the patient bone scans at regular intervals are essential to detect bone metastases and tumour recurrence. The scintigraphic findings have to be correlated with radiographs and if these are negative a short-term control is indicated. Three-phase bone scans can assess the tumours response to therapy.

Adolescent↗
PubMed1989

[Digital multilayer tomography. A description of the method and initial clinical results].

A set of projection images is acquired during longitudinal tomography with an image intensifier TV system. Reconstruction of tomograms in each desired plane is achieved by shifting and summing up of the digitalized projection images. Digital multilayer and conventional film tomograms mainly of the respiratory tract and skeleton have been compared in 100 patients. Image quality is comparable with both methods. Disadvantage of digital tomography is lower spatial resolution (512 x 512 matrix size); advantages include lower radiation dose, shorter study time, and facilities of digital imaging.

Bone Diseases↗
PubMed1989

Sonography versus peritoneal lavage in blunt abdominal trauma.

The reliability of sonography and peritoneal lavage in assessing the need for immediate surgical intervention in blunt abdominal trauma was examined in a prospective study (n = 71). Statistical analysis revealed a sensitivity of 100% for peritoneal lavage compared to 84% for sonography; the accuracy was 99% versus 86%, the predictive value 97% vs. 89%. The statistical difference was significant (p less than 0.05). The results demonstrate that sonography cannot replace peritoneal lavage in the diagnosis of blunt abdominal trauma. The discussion of the advantages and disadvantages of both methods shows that sonography and peritoneal lavage are not competing, but rather, are complementary examinations.

Abdominal Injuries↗
PubMed1988

[Oncocytoma of the kidney. 1. Computed tomography].

The computer tomograms of 22 patients with renal oncocytomas were analysed retrospectively. Characteristic findings were: 1. solid round space-occupying lesions (22/22), 2. sharp demarcation from the kidney (20/22), 3. smooth margin (20/22), 4. hypodensity after intravenous contrast (20/20), 5. enhancement (19/19), 6. central hypodense nidus (16/22), 7. homogeneous beyond the nidus (11/22). In the presence of these criteria, the diagnosis of an oncocytoma may be suspected. Safe differentiation from a renal cell carcinoma may not always be possible.

Adenoma↗
PubMed1988

[Oncocytoma of the kidney. II. Angiography].

The angiographic findings in ten patients with renal oncocytoma are described. Characteristic features include: absence of encasement, vascular occlusions, arterio-venous shunts and contrast lakes (8/10). Spoke-wheel arrangement of tumor vessels (8/10). Homogeneous tumour contrast during the capillary phase (7/10). Sharp demarcation from the kidney and surroundings (9/10) and a peritumoral halo (4/10). If the suspicion of an oncocytoma is raised by CT examination of a space-occupying lesion (part I), angiography should be performed to confirm the diagnosis and help in planning surgical treatment.

Adenoma↗
PubMed1988

[Malignant fibrous histiocytoma].

Malignant fibrous histiozytoma (MHF) is a pleomorphic sarcoma of ubiquituous origin. The clinical and radiological features of the tumor are illustrated by 23 patients with MFH of soft tissue and 4 MFH of bone. On conventional radiography MFH appears as a soft tissue tumor, sometimes with bone involvement; on sonography it is usually non-homogeneous and hypoechogenic with areas of necrosis. On CT the masses are homogeneous or inhomogeneous (10-60 HU.) containing areas of decreased density. Contrast enhancement was about 10-20 HU. Angiographically the tumor appears as hypo- or hypervascular with pathologic vessels. The morphology of MFH in diagnostic imaging including magnetic resonance tomography is discussed with the relevant literature.

Adolescent↗
PubMed1988

[Results of PTCA following thrombolysis in acute myocardial infarct].

The mortality in acute transmural myocardial infarction can be reduced by thrombolytic therapy administered within 6 hours after onset of symptoms. In patients with coronary angiography proven stenosis of less than 70% conservative therapy is recommended. In patients with one vessel disease PTCA in patients with suitable lesions should be used. Further studies have to elucidate, if the angioplasty has to be performed in the acute stage or on an elective basis. PTCA is recommended in patients with occluded coronary vessels and in patients with high grade stenosis and limited coronary blood flow. In patients with multi vessel disease aortocoronary bypass surgery is recommended to reduce high mortality. Long-term results demonstrate, that patients in whom PTCA or coronary bypass surgery was performed demonstrated the highest survival rate.

Angioplasty, Balloon↗
PubMed1988

[Morphology of the coronary arteries following percutaneous transluminal coronary angioplasty with hemopericardium].

Autopsy findings in a patient with cardiac tamponade following percutaneous transluminal coronary angioplasty (PTCA) are reported. Angiography during PTCA demonstrated coronary dissection without extravasation of contrast medium at the site of angioplasty. Histologic examination of the dilated coronary segment revealed longitudinal splitting of intima and media as well as circumferential subintimal and submedial dissection. Hemorrhage into plaque, intima, media, adventitia and dissection lumina was found. Disruption of the adventitia was not present. Cardiac tamponade may occur transadventitially without complete disruption of the coronary artery and without extravasation of contrast medium.

Aged↗
PubMed1988

[Diagnosis of duodenal wall hematoma].

Blunt trauma to the epigastrium is becoming an increasingly important cause of injury and may result in retroperitoneal haematoma involving the head of the pancreas as well as the descending duodenum. Ultrasound seems to be of great advantage in the diagnosis of the effects and complications of blunt abdominal trauma such as obstruction of the biliary tree, the gastric outlet and the inferior vena cava. Direct involvement of the descending duodenum seems to be relatively uncommon, intramural haematoma of the duodenum is described only rarely in the literature. Three additional cases of intramural haematoma of the duodenum are reported with particular reference to the recent literature.

Adult↗
PubMed1986

Morphology of the coronary arteries after combined thrombolysis and percutaneous transluminal coronary angioplasty for acute myocardial infarction.

Autopsy findings are reported for 6 patients who died early (8, 9, 12, 13 and 14 days) or late (52 days) after combined thrombolysis and percutaneous transluminal coronary angioplasty (PTCA) for acute myocardial infarction. Morphologic changes in the coronary arteries at the site of revascularization included injury to the inner portion of the arterial wall (intimal splitting, subintimal dissection, medial tears and submedial dissection) and necrosis of medial smooth muscle cells. Residual mural thrombi and thrombotic reocclusion were noted within the arterial lumen. There was a beginning neointima formation in all patients who died early and a reobstructing neointima proliferation in the patient who died late after PTCA. The results of this study support the suggestion that both rupture and dissection of the inner arterial wall and necrosis of the tunica media resulting from irreversible dilatation of the grossly intact outer layers are the most important mechanisms of PTCA. Response to arterial wall injury after PTCA is a neointima formation leading to covering of mural thrombi and thrombogenic intimal, medial and adventitial substances and smoothing of the luminal surface. Large residual mural thrombi and excessive neointimal proliferation may cause restenosis within a few weeks.

Aged↗