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Biomedical subjects

B Wimmer

Publications and source records attributed to B Wimmer.

At least 55 records · Page 3Linked to original sources
PubMed1989

[Computed tomography of spinal injuries].

Computed tomography images are free of superpositional effects. Therefore, today CT represents the most effective method of evaluating spinal fractures. Clear imaging of the vertebral elements provides a sufficient analysis of stability in most cases. Moreover, in the polytraumatized patient, every region of the body can be evaluated without new positioning. Thus, the sequence of therapy may become obvious within a reasonable amount of time. The 3-column theory has proved to be very effective for evaluation of the remaining stability in spinal fractures.

Fractures, Bone↗
PubMed1989

[Tuberculous bilocular cystic hygromas of the right hand and forearm].

A rare complication of bone tuberculosis is bicameral hygroma of the hand and forearm. The transverse separation is caused by the retinaculum flexorum. Tendons can be destroyed by inflammatory changes of the synovial fluid. Experience with the few patients treated so far suggests that total extirpation combined with tuberculostatic therapy is necessary for the attainment of a cure.

Forearm↗
PubMed1988

[Limitations of computed tomographic differential diagnosis of focal liver changes].

Computed tomography of the liver is essential when there are discrepancies between ultrasonography, physical examination and laboratory findings. However, sometimes the referring clinicians overestimate the true accuracy of CT. Some of its major pitfalls include the limited spatial resolution and consequent false-negative results in the case of small focal lesions; further disadvantages are the inadequate contrast between a lesion and surrounding liver parenchyma, and limited specificity even in perfusion studies. When typical patterns in contrast and density of a cyst, hemangioma and focal nodular hyperplasia are present an accurate diagnosis is achieved. In atypical cases and in all other liver lesions further investigations will be necessary.

Diagnosis, Differential↗
PubMed1988

[Predictive value of magnetic resonance tomography in comparison with sonography and computed tomography in the diagnosis of focal liver lesions].

Ultrasonography and computed tomography are widely used for the diagnosis of focal lesions of the liver. However, the possibilities for tumor characterization and determination of potential malignancy are limited in many cases. Evaluation by magnetic resonance imaging shows a good correlation of relaxation time with the amount of stroma as a proportion of the total cell content of a lesion. This allows differentiation for a number of lesions. Thus, the combination of ultrasonography and magnetic resonance imaging could provide the ideal diagnostic procedure in many cases.

Adult↗
PubMed1988

[The Cruveilhier-von Baumgarten syndrome. Presentation of radiologic findings based on a case].

Marked portosystemic venous anastomosis of the parumbilical veins is referred to as the Cruveilhier-Baumgarten syndrome. Opening of these vessels has been described mainly in the sonographic literature. In this case report CT and MR findings are presented, which have been confirmed by angiography. This paper is intended to draw the radiologist's attention to dilatation of the parumbilical veins, which is a highly specific sign of portal hypertension resulting from intrahepatic blockage.

Humans↗
PubMed1988

[Bone biopsy of uncertain bone lesions using a new biopsy cannula measuring 1.4 mm].

Bone biopsy for the clarification of ambiguous lesions has until now been the last resort in diagnostic procedures because obtaining the material for histological evaluation has involved very traumatizing methods (biopsy by surgical intervention, percutaneous biopsy with high-caliber needles). A new bone-biopsy apparatus has now been developed that is provided with a cannula not much larger than a fine needle (1,4 mm); it can be used to obtain histologically evaluable biopsy material from almost all regions of the skeletal system. As the procedure can be carried out under local anesthesia, there is no undue stress to the patient. The complication risk is no higher than when using conventional fine-needle biopsy. Despite the small diameter of this needle it is possible to obtain biopsy specimens not only of osteolytic but also of osteoplastic lesions. An electric motor (20 rotations/min) is the power source for apparatus. The value of bone biopsy in diagnostic procedures has increased considerably.

Biopsy↗
PubMed1988

[Diagnosis and therapy of xanthogranulomatous pyelonephritis].

Xanthogranulomatous pyelonephritis (XGP) is a rare, unilateral and multifocal inflammatory response of the kidney against bacterial toxins. In the Department of Urology of the University of Freiburg 6 patients with XGP were observed within 10 years. Despite modern diagnostic procedures differential diagnosis from kidney tumors and other parenchymal kidney diseases remains difficult. Recurrent urinary tract infections, fever, urolithiasis, obstruction and leucocytosis may be indicative of XGP. The diagnosis has to be confirmed by surgical intervention which preferably should preserve functioning renal tissue. The prognosis in general is quite good.

Adolescent↗
PubMed1987

Computerised tomography after abdominal aortic aneurysm repair.

CT scan early after AAA resection and graft implantation enables the detection of local complications such as extensive haematomas around the implanted graft (25 cases), gas bubbles (7 cases) fluid collections, inflammatory infiltration in the tissue around the graft and compression of organs in the neighbourhood (1 case) to be detected. The possibility of detecting these complications as early as possible allows effective treatment. The addition of CT guided needle biopsy to allow culture of suspicious material makes this a very useful technique. For these reasons routine postoperative CT scanning after aortic aneurysm surgery is recommended.

Aorta, Abdominal↗
PubMed1987

[Sonographic imaging and assessment of stomach wall changes].

By the use of a special method of investigation, the true value of percutaneous echography was investigated using 28 patients with primary gastric neoplasms and 3 patients with secondary infiltration of the gastric wall, for the proof and the judgement of the tumors, their extension and their metastases. Tumorous gastric wall thickening could be demonstrated in 87% (27/31), tumor invasion in neighbouring structures in 85% (12/14) and lymph nodes metastases in 66% (10/15). In all patients, who had liver metastases (4) or ascites (5) they were demonstrable. The sonographic appearance of the different gastric wall changes are described and discussed.

Adult↗
PubMed1987

[Initial clinical experiences with RARE-MR urography].

Potentials and limitations of a new, facultative non-tomographic Fast-Imaging sequence "RARE-MR-Urography" are presented. Its results in urological diseases are discussed on the basis of a pilot study of 35 patients. The images (4 s-32 s acquisition time) are extremely T2-weighted and display unbounded free water (urine). They reveal valuable information, not available with ultrasound or conventional radiology without application of contrast agents in the presence of urine retention. S/N problems reduce the accuracy of this method if the urinary tract contains only small amounts of urine.

Humans↗
PubMed1987

[Computerized tomography in thoracic trauma].

Chest CT scans were obtained in 86 patients suffering from serious blunt or penetrating chest trauma. The finding of mediastinal widening was by far the most common CT indication. CT proved to be a more sensitive method for detection of parenchymal lung lesions and occult pneumothorax than bedside radiographs. CT contributed substantially in differentiation of lung abscess and empyema, exclusion of mediastinal pathology and spinal injuries. Aortography is still indicated, even when CT findings are normal if aortic laceration is clinically suspected. Despite all of the technical problems combined with CT examinations in the critically ill patient, we consider CT a valuable diagnostic tool for certain problems in the traumatized patient.

Aortic Dissection↗
PubMed1987

[The thymus gland in computerized tomography. Normal findings and pathology].

The diagnostic value of CT in follicular thymic hyperplasia and in thymomas in 8 patients with myasthenia gravis and in 12 patients without myasthenia gravis suffering from thymic tumors was evaluated by correlating CT-findings to surgical results and pathological-histological findings. Thymic size of the six patients with histologically proven follicular hyperplasia were scattered within the normal range, but half of them were at the upper limit. Thymic tumors were differentiated between invasive and non invasive tumors by CT staging. Solid tumors with different histology could not be further classified; the attenuation values ranging from 15-55 HU were the same in tumors, follicular hyperplasia and normal thymus.

Carcinoid Tumor↗
PubMed1987

Radiologic findings in peripheral neurilemoma.

Neurilemoma is a primary nerve sheath tumour that usually arises from a peripheral nerve. In a series of eight solitary neurilemomas four benign and four malignant tumours are observed. Three neoplasms are of intrathoracic origin, four tumours arise in the retroperitoneal space and one tumour develops in the duodenal wall. Radiographic findings using computed tomography, ultrasonography and arteriography are presented. All neurilemomas show relatively low density in CT compared with other parenchymal tumours. All benign and three of the malignant neurilemomas reveal good contrast enhancement. Arteriography has an important role in defining the tumour's blood supply and establishing the origin of the tumour. Five of six neurilemomas show hypervascularity in arteriography. Ultrasonography shows cystic degeneration in three malignant and in one benign neurilemoma. Pathologic correlation of peripheral neurilemoma is discussed by using a special immunoperoxidase technique.

Adolescent↗
PubMed1986

[Preoperative staging of rectal cancer with computer tomography].

The correlation of the preoperative staging by CT with the postoperative staging was prospectively investigated in 112 patients with carcinoma of the rectum. The influence of CT on the choice of surgical treatment was also proven. The evaluation of the infiltration of perirectal tissue and especially of other organs is possible with CT. According to TNM classification the pre- and postoperative staging showed identical results by conventional diagnostic methods in T1 in 7/16, in T2 in 22/38, in T3 in 37/49 and in T4 in 5/9 patients. With the additional CT identical results were found in T1 in 7/14, in T2 in 25/31, in T3 in 49/53 and in T4 in 13/14 cases. Thus, the preoperative staging turned out to be correct with CT in 94/112 cases (83.9%). By conventional diagnostic methods identical results were found in 71/112 patients (63.4%). The infiltration of other organs was suspected preoperatively in 24 cases with CT and was found intraoperatively in 30/112 (accuracy 94.6%, sensitivity 88%, specificity 96%). Metastases of lymph nodes were suspected in the tomograms in 32/49 patients (65.3%). By the differentiated interpretation of the tumor growth with special regard to the "Grenzlamellen" of the rectum the CT gives important information for planning therapy.

Adenocarcinoma↗
PubMed1986

[Pancreas divisum as a possible cause of misinterpretation in ERCP, computed tomography, sonography and MDP].

In 488 patients endoscopic retrograde pancreatography (ERP) revealed a pancreas divisum in 21 (4.3%): in 17/21 patients we found a complete, in 4/21 an incomplete separation of the pancreatic ducts. The pancreas divisum is caused by a malfusion of the ductal system. On examination by ultrasound, computed tomography or hypotonic duodenography this variant can suggest an inflammation or tumour of the head of the pancreas. A definite diagnosis is possible by ERP only. Since the small ventral duct can be confused with an alteration caused by inflammation or by a tumour, to much of contrast medium can be injected. Pancreas divisum is often associated with a chronic pancreatitis which can be demonstrated via ERP of the dorsal duct through the accessory papilla.

Cholangiopancreatography, Endoscopic Retrograde↗