Search PubMed⌕ Search

Biomedical subjects

D Beyer

Publications and source records attributed to D Beyer.

At least 55 records · Page 3Linked to original sources
PubMed1988

[X-ray diagnosis of colorectal carcinoma today--a determination of where we stand].

Long-term prognosis of this malignant and frequent disease can be improved only by early diagnosis of small polyps and of carcinomas in the early stage. It is necessary to coordinate high-quality colon contrast medium enemas (double-contrast method) and hypotension with coloscopy and endoscopic removal of polyps. If a colon carcinoma is identified, it is additionally also necessary--probably mostly by colon enema--to exclude preoperatively a metachronous second carcinoma which can be expected in about 5% of the cases. Ultrasound and computed tomography will help in visualising advanced carcinomas that have already passed the wall and are borderline cases in respect of operability, as well as in identifying lymph node and liver metastases, besides in identifying complicating local perforations. Proof, however, is only rendered by a positive finding. It will be necessary to determine at what extent magnetic resonance can be useful in this context.

Colonic Neoplasms↗
PubMed1987

[Value of magnetic resonance tomography prior to surgery and irradiation of peripheral soft tissue tumors].

The experience with magnetic resonance imaging (MRI) of 37 patients with peripheral soft tissue tumours and tumour-like lesions is reported. MRI proved to be a highly sensitive method in detecting soft tissue tumours. The main advantages of MRI compared to CT were the high contrast resolution of MRI and the multiplanar display. The anatomic setting of the soft parts tumour could be defined in most cases as either intracompartmental or extracompartmental. The relationship to the major neurovascular bundles and bone could be assessed accurately. Tumour-induced subtle periosteal reactions and cortical erosions are better defined with CT and plain film, especially. An imaging technique using small excitation angles, echoes produced by gradient inversion and extremely fast repetition times ("Fast Field Echo Imaging") is capable of producing MR images in only a few seconds acquisition time. Preliminary experience shows that soft tissue tumours can be evaluated with this rapid pulse sequence.

Chondroma↗
PubMed1987

[MR of the shoulder joint with surface coils at 1.5 tesla. Its anatomy and possible clinical use].

High spatial resolution magnetic resonance images of the shoulder were obtained in axial, sagittal and coronal orientations using a 1.5 T imaging system and anatomically shaped, wrap-around surface coils. Variations in scapular position induced by patient positioning change the relationship of the planes to the shoulder anatomy and make reproducibility of sagittal and coronal planes difficult. We, therefore, use--after axial orientation--image-oblique planes perpendicular and parallel to the glenoid fossa. In this manner MRI can visualise the anatomic structures of the shoulder including rotator cuff, long biceps tendon, articular capsule, articular cartilage, muscles and bones due to the high soft tissue contrast of MRI.

Humans↗
PubMed1987

[DSA for the imaging of tumor-caused vascular changes and complications during local chemotherapy of the liver via the portal system].

In 18 patients with primary or secondary liver tumours, 38 digital subtraction angiographies (DSA) of totally implanted catheter systems for liver perfusion were performed during a period of 8 months. The systems had been used for an average of 6.9 months. In 22 out of 38 examinations secondary reactions of liver arteries were observed, in 7 the therapeutic regimen was changed after DSA. Patients with an extensive tumour involvement of the liver showed mural thromboses or obstructions of liver arteries relatively more often (4 of 7) than patients with smaller size tumours (2 of 11). In 7 cases the therapeutic regimen was changed after DSA. DSA of implanted liver catheters is a valuable, well tolerated, easily and rapidly performed method.

Adult↗
PubMed1987

[Primary malignant lymphoma of the stomach. Barium meal, sonography and computed tomography].

The features of barium meal, ultrasonography and CT in 18 patients with proven primary gastric lymphoma were analyzed retrospectively. Only barium meal could reveal highly suspicious features in 16 cases, whereas ultrasonography and CT showed a non specific wall thickening. Although single signs in a barium meal are non-specific, the combination of clubbing of mucosal folds, atypical ulcerations and extensive mural infiltration is highly suspicious of lymphomatous involvement. A negative barium meal, ultrasonography and/or CT result does not exclude gastric lymphoma.

Adult↗
PubMed1987

[Imaging of iatrogenic aneurysms and AV fistulas of the lower extremity with IV-DSA and sonography].

Using IV-DSA and ultrasound (real-time), we demonstrated 13 false aneurysms, 2 isolated AV fistulas, 7 aneurysms of profunda patches and 8 aneurysms of bypass grafts. Aneurysms and AV fistulas developed in all 30 patients after different diagnostic and therapeutic procedures. Ultrasound showed partial thromboses of the aneurysms, perivascular changes and compression of the femoral vein, that could not be demonstrated by IV-DSA. On the other hand IV-DSA allowed the recognition of important findings not shown sonographically, such as AV fistulas and stenoses of the proximal and distal arteries. These findings were relevant for further surgical approach. It is therefore concluded that in patients with suspected aneurysm of the femoral or popliteal artery, IV-DSA and ultrasound should be used in conjunction rather than as alternative methods.

Adult↗
PubMed1987

[Complications of intravenous digital subtraction angiography--results in 500 patients].

500 patients were studied respectively for complications of intravenous digital subtraction angiography (IV-DSA) performed with non-ionic contrast media, using a central venous injection technique. In 21 patients (4.2%) during or shortly after the procedure 23 systemic, 1 neurologic, and 7 local complications occurred. In addition 1 patient developed acute renal failure 26 hours after the IV-DSA, whereas 4 patients later showed on thromboses of the catheterised vein. No permanent neurologic or systemic complications and severe allergic reactions were seen.

Acute Kidney Injury↗
PubMed1987

[Sonographic findings in complications of cystic echinococcosis].

Apart from the difficult differential diagnosis of hydatid liver disease, diagnostic problems may increase in chronic disease because of complications. Compression or infiltration of bile ducts is the most common complication occurring in 16%. Other complications are infiltration of adjacent organs and structures, for instance the right kidney and the diaphragm, or the (often iatrogenic) rupture of hydatid cysts with intraperitoneal spread. Preoperative sonographic diagnosis is important in influencing the surgical procedure.

Adult↗
PubMed1987

[Complications of brachiocephalic catheter angiography using a non-ionic contrast medium].

In 713 patients 749 catheter-arteriographies of aortic-arch and cerebral vessels were performed using non-ionic contrast media. The patients were examined either with DSA or conventional film techniques. In 80 examinations of 76 patients complications or side-effects were noted, which resolved completely within one hour in 69 cases, showed a duration up to 7 days in 6 cases, and persisted longer than 7 days in 5 patients. Neurological complications were seen in 6.4% of the studies. There was no death. Patients, who received anti-hypertensive drugs before or during angiography and patients with a pathological angiogram had a significantly higher complication-rate. The rising number of patients with atherosclerotic cerebrovascular disease showed an unfavorable effect upon the overall complication-rate. The use of a non-ionic contrast medium did not drastically lower the rate of neurological complications.

Adult↗
PubMed1986

[Germinative testicular tumors. On the current status of diagnosis, therapy and prognosis].

On the basis of results obtained in a multicentric study on testicular tumors (Bonn 1982) including our own group of patients, we give an outline of the present state of modern diagnosis, therapy, and prognosis concerning germinative tumors of the testes: Etiologically essential is an unknown dysontogenetic disturbance of both gonads. The only clinical predilection factor is cryptorchism. Among the new diagnostic methods, specific tumor markers and high-resolution ultra-sonography have been proved especially useful. In non-seminomas, orchidectomy and lymphadenectomy is followed by chemotherapy instead of radiation therapy, today. Polychemotherapy has greatly improved the prognosis. Andrologically most interesting questions concerning sperm conservation, limited retroperitoneal lymphadenectomy, as well as late sequelae of chemotherapy cannot be definitely answered. Our findings rise new questions, which are fully discussed in concluding remarks.

Combined Modality Therapy↗
PubMed1986

Computed tomography in the differential diagnosis of the enlarged retrorectal space.

The value of computed tomography (CT) in the differentiation of an enlarged retrorectal space was analyzed in 132 cases. Classification of barium enema findings into those with simultaneous mucosal alterations and those without any visible lesions of the rectal mucosa seems to be useful. Computed tomography helps in those cases without mucosal changes to differentiate between retrorectal fibrosis, tumorous masses, and inflammatory diseases of the colon. It also demonstrates the lack of pathologic lesions in equivocal cases of pelvic lipomatosis and so-called "normal variants." If simultaneous mucosal involvement on barium enema--especially in rectal carcinoma or recurrent carcinoma of the rectum--is found, CT may show the perirectal extension of tumorous masses and thus help to clarify local operability.

Abscess↗
PubMed1986

[Real-time sonography in the diagnosis of neck cysts].

The diagnostic possibility of high resolution real time sonography has been investigated in 31 patients with cysts in the neck. The method is of special value preoperatively by demonstrating neighbouring structures, such as the parotid and thyroid glands and the major vessels in the neck; it contributes to differential diagnosis and surgical planning. Lateral cysts, because of their contents, may be highly echogenic and may be difficult to distinguish from lymphomas. The differential diagnosis of various cysts in the neck is discussed. An important aspect of sonography of the neck is the experience of the operator and his detailed knowledge of the local anatomy.

Cysts↗
PubMed1986

[Gastrointestinal amyloidosis as a differential diagnostic problem].

The diagnostic radiologist may have problems with the differential diagnosis of gastrointestinal amyloidosis combined with only uncharacteristic clinical symptoms. In the stomach upper gastrointestinal series show in most cases stenosing submucosal masses in the gastric antrum with diminished peristalsis and pliability. Sonography reveals a circular thickening of the gastric antrum wall. Only a synopsis of radiologic changes, the patients's history, laboratory tests and biopsies render a clue to the correct diagnosis. In the small bowel segmental or total intestinal dilatation with sonographically demonstrable thickening of the bowel wall and diminished motility, prolonged transit and eventually obstruction or paralytic ileus can be demonstrated. In patients with simultaneous plasmocytoma the radiologist has to take a gastrointestinal involvement by concurrent amyloidosis into account.

Aged↗