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  • 1
    Electronic Resource
    Electronic Resource
    Spiral CT angiography of renal arteries: comparison with angiography (1999)
    Springer
    European radiology 9 (1999), S. 546-551 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Hypertension ; renal ; Renal angiography ; Renal arteries ; stenosis or obstruction ; Computed tomography (CT) ; helical technology ; Computed tomography (CT) ; three-dimensional
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. A prospective study was carried out to determine the accuracy of spiral CT angiography (CTA) in the detection of renal artery stenosis (RAS). Eighty-two patients with arterial hypertension underwent CTA and digital subtraction angiography (DSA) to exclude RAS. For CTA a contrast medium bolus of 100–150 ml (flow rate 3 ml/s) was injected. A 24 or 40 s CTA was started at the origin of the superior mesenteric artery after a delay time determined by test bolus injection (collimation = 2 mm, pitch = 1/1.5). For stenosis detection transverse images supported by maximum intensity projections (MIP) or multiplanar reconstruction projections were used. Of 197 renal arteries examined (including 33 accessory arteries), 34 RAS were visualized using DSA. With CTA, one hemodynamic RAS was missed and one additional hemodynamic RAS was found. Sensitivity/specificity was calculated to be 94 %/98 %. For hemodynamically relevant RAS (〉 50 %) the sensitivity/specificity was 96 %/99 %. CTA additionally depicted five adrenal masses. The high accuracy rate of RAS detection thus allows the use of CTA as a screening method in patients with arterial hypertension to exclude a renovascular cause.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050707
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  • 2
    Electronic Resource
    Electronic Resource
    Multivariate analysis of the adjustment of the colour Duplex unit for the differential diagnosis of lymph node alterations (1999)
    Springer
    European radiology 9 (1999), S. 1445-1450 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Ultrasonography ; Colour Doppler ; Lymphatic system ; Neoplasms ; Lymph nodes ; Blood supply
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Intranodal angioarchitecture was used as criterion for the differential diagnosis of lymph node alterations by colour duplex sonography. The influence of the adjustment of the duplex unit on the diagnostic accuracy and on the rate of lymph nodes with detectable intranodal flow signals was tested. A total of 243 superficial lymph nodes in 127 patients were included in a retrospective study. Diagnoses were approved by histopathology (n = 173) or clinical follow-ups (n = 70 reactive lymph nodes). The intranodal angioarchitecture and sonomorphology were assessed. We used nonparametric discriminant analysis in order to define appropriate settings for transducer frequency, flow mode, power and threshold which result in the best diagnostic quality. Of the lymph nodes, 87 % displayed flow signals using a threshold of ≥ 13 and the flow modes low or medium. Vascularisation was detected only in 47 % of the nodes assessed with different adjustments. Diagnostic accuracy dropped from 94 to 68–84 % if threshold was 〈 13 or power was less than –11 dB. An insufficient adjustment of the colour duplex unit decreases the chance of detecting intranodal flow signals and impairs the diagnostic quality of colour duplex sonography. Flow mode, power and threshold are the most important parameters which have to be adjusted properly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050868
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Current value of double-contrast pharyngography and of computed tomography for the detection and for staging of hypopharyngeal, oropharyngeal and supraglottic tumors (1999)
    Springer
    European radiology 9 (1999), S. 1843-1850 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Pharynx ; Larynx ; Neoplasms ; Radiography ; CT ; Deglutition disorders
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. In light of recent endoscopic techniques the current value of double-contrast pharyngography (DCP) and of CT for detection and staging of hypo-, oropharyngeal, and supraglottic tumors is evaluated. The DCP of 151 patients and CT obtained from 99 of these patients were retrospectively analyzed in a double-blinded manner. We used a standard protocol which comprised all relevant anatomical subregions. Results were compared with direct microlaryngoscopy (DL), indirect laryngoscopy (IL), and post-operative histopathological findings. Sensitivity and specificity of DCP was 75.0 % and 86.7 %, respectively. The DCP and IL techniques together yielded a higher sensitivity (96.7 %) than each method separately. Sensitivity and specificity of CT was 87.5 and 100 %, respectively. In 74.7 % CT provided correct staging. Subregional analysis revealed that the results of DCP and CT depend highly on the localization of the tumor. Our results indicate that DCP represents an important screening method for diagnosing hypo-, oropharyngeal, and supraglottic tumors to complete IL and DL. We show that CT is a reliable method for preoperative staging, although small superficial tumors may occasionally be missed by this method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050933
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  • 4
    Electronic Resource
    Electronic Resource
    Compression repair of femoral post-catheterisation pseudoaneurysms guided by colour Doppler flow imaging (1995)
    Springer
    European radiology 5 (1995), S. 285-290 
    Details
    ISSN: 1432-1084
    Keywords: Aneurysm, complications ; Aneurysm, therapy ; Catheterisation, complications ; Ultrasonography, therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Sixty femoral pseudoaneurysms were identified by colour Doppler flow imaging over a period of 27 months. One group (n = 42) was treated immediately by ultrasound-guided compression repair (UGCR). In the remaining 18 pseduaneurysms a conservative theraphy attempt, which was successful in 9 patients within 1 week, preceded UGCR. Unsuccessful conservative theraphy did not prejudice the feasibility and outcome of UGCR. the success rate (50 of 51 UGCR) was higher than that reported in the literature, but was at the expense of a longer compression time.Multiple parameters were correlated with the compression time. A significant correlation was found with the size of the perfused lumen in the pseudoaneurysm and with the diameter, lenght and shape of the aneurysm neck. Follow-up at 24 h and 1 week after UGCR revealed 1 thrombotic complication and 4 partial recurrences. Within 1 week there was a significant decrease in the size of the (then thrombosed) pseudoaneurysms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00185313
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  • 5
    Electronic Resource
    Electronic Resource
    Vascular patterns in reactive and malignant lymphadenopathy (1996)
    Springer
    European radiology 6 (1996), S. 473-480 
    Details
    ISSN: 1432-1084
    Keywords: Color Doppler flow imaging ; Ultrasonography ; Lymphoma ; Lymph node ; Lymph node blood supply
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A total of 130 superficial lymph nodes were evaluated using color Doppler flow imaging (CDFI) in order to differentiate benign from malignant lympadenopathy. The patterns of intranodal flow signals detected at standardized conditions by CDFI were classified using eight self-defined criteria and were correlated with the histopathological or clinical diagnosis. Nonparametric discriminant analysis showed that four vascular patterns were suspicious of malignancy: (a) avascular areas, (b) displacement of intranodal vessels, (c) accessory peripheral vessels and (d) aberrant course of central vessels. Of the neoplastic lymph nodes (n = 73), 96 % showed at least one pathological vascular pattern. Malignancy could be excluded in 95 % of 57 reactive lymph nodes using these four criteria. Most reactive lymph nodes in contrast demonstrated a vascular hilus and/or vessels running at the long axis of the lymph node with branches to the cortex. There was a diagnostic accuracy of 41–82 % in the additionally evaluated sonomorphological (size, shape, echogenicity) and Doppler (increased Pourcelot's or pulsatility indices) criteria. The definitive interpretation of the promising results of this retrospective study requires confirmation of examiner independency as well as prospective evaluation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00182474
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  • 6
    Electronic Resource
    Electronic Resource
    Chronic recurrent osteomyelitis with clavicular involvement in children: diagnostic value of different imaging techniques and therapy with non-steroidal anti-inflammatory drugs (1997)
    Springer
    European journal of pediatrics 157 (1997), S. 28-33 
    Details
    ISSN: 1432-1076
    Keywords: Key words Chronic recurrent multifocal osteomyelitis ; SAPHO syndrome ; Diagnostic imaging ; Non-steroidal anti-inflammatory drugs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Chronic recurrent, uni- or multifocal osteomyelitis (CRMO), an inflammatory disorder of unknown origin, involves mk:/night/arul/4310946m.3dultiple osseous sites and may affect the clavicle. We report on 6 children with clavicular involvement out of 11 children suffering from CRMO. The major clinical symptoms were local swelling and pain. Five children had hyperostosis of the clavicle and synovitis of adjacent joints. Histology showed chronic osteomyelitis with a predominance of lymphocytes in the inflammatory infiltrates. Cultures of biopsy tissue specimens were sterile. The patients were followed for at least 3.5 years. Three patients had up to six relapses. The most effective diagnostic tools to define CRMO were standard X-ray and bone scan in combination with biopsy and cultures. In our patients CT and MRI were misleading as they suggested the presence of malignancy. However, the sensitivity of MRI to detect involvement of bone, adjacent joints and soft tissues were better in comparison to X-ray or bone scan. Non-steroidal anti-inflammatory drugs were effective in reducing pain, swelling and limitation of motion. Reconstructive surgery was not indicated in any case. The long-term outcome of growth and function of affected bones was excellent. Conclusion Diagnosis of chronic osteomyelitis of the clavicle should be made by history and physical examination and be confirmed by standard X-ray, bone scan and open biopsy. In contrast MRI and CT can provide data on the involvement of adjacent joints, soft tissue and muscles especially in the early process of disease, but do not add information relevant to the patient's management. Treatment with non-steroidal anti-inflammatory drugs is rapidly beneficial in most patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004310050761
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