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  • 1
    Electronic Resource
    Electronic Resource
    Unusual manifestation of an osteoid osteoma of the capitate (1999)
    Springer
    European radiology 9 (1999), S. 1098-1100 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Osteoid osteoma ; Carpal bones ; Capitate ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. A case of osteoid osteoma of the capitate in a 29-year-old male is reported. The patient suffered from unspecific clinical findings and a 3-year history of uncharacteristic wrist pain. Conventional radiographs of the wrist revealed a circumscribed sclerosis in the proximal part of the capitate bone beside a diffuse demineralisation of the carpal bones. Magnetic resonance imaging demonstrated a circumscribed, tumorous lesion with marked enhancement after IV administration of contrast agent and a highly calcified nidus, which was sharply demarcated by a small rim of granulation tissue from the surrounding spongious bone. Based on MRI findings, the diagnosis of an osteoid osteoma was established and confirmed after operation and histologic analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050797
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  • 2
    Electronic Resource
    Electronic Resource
    MR arthrography of the shoulder: comparison of low-field (0.2 T) vs high-field (1.5 T) imaging (2000)
    Springer
    European radiology 10 (2000), S. 989-996 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Shoulder – MR arthrography – Field strength – Rotator cuff – Glenoid labrum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The objective of this study was to compare the image quality, sensitivity, specificity, and diagnostic accuracy of an open low-field MR system (0.2 T) with a standard high-field MR system (1.5 T) after arthrography of the shoulder. Thirty-eight patients either with suspected chronic instability (n = 12) or rotator cuff abnormalities (n = 26) were examined. Intra-articular injection of diluted Gd-DTPA was followed in randomized order either first by imaging on an open 0.2-T system or on a 1.5-T system. The image material was evaluated independently by two radiologists in a blinded fashion with respect to overall image quality and the detection of rotator cuff as well as capsular and labral abnormalities. Surgical correlation was available in 27 (71 %) of 38 patients. For both systems, sensitivity and specificity for rotator cuff tears were 100 % each, and for labrum pathologies, these values were 100 and 93 %, respectively. The agreement for detection of labral pathologies between low-field and high-field examinations was good (ϰ = 0.69, ϰ = 0.61). For the detection of full-thickness tears of the rotator cuff, the agreement between the low-field and high-field MR examinations was very good and significant (ϰ = 0.94, ϰ = 1, p 〈 0.001). Overall image quality was rated good in 17 (45 %) and fair in 21 (55 %) of 38 cases on the 0.2-T MR system, and good in 32 (84 %) and fair in 6 (16 %) of 38 cases on the 1.5-T system. Motion artifacts were considered low in 24 (63 %) and moderate in 14 (37 %) of 38 cases for the 0.2-T system and low in 34 (89 %) and moderate in 4 (11 %) for 1.5-T system. Based on our results, low-field MR compares favorably to high-field MR in the detection of major abnormalities of the glenohumeral joint, at least when MR arthrography is used. Disadvantages are the duration of the examination and thus the risk of reduced image quality caused by motion artifacts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300051050
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  • 3
    Electronic Resource
    Electronic Resource
    Injuries of the lateral collateral ligaments of the ankle: assessment with MR imaging (1999)
    Springer
    European radiology 9 (1999), S. 519-524 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Ankle ; Ankle sprain ; Lateral collateral ligaments ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The aim of this study was to evaluate the ability of MRI to display injuries of the lateral collateral ligamentous complex in patients with an acute ankle distorsion trauma. The MR examinations of 36 patients with ankle pain after ankle distorsion were evaluated retrospectively without knowledge of clinical history, outcome and/or operative findings. The examinations were performed on a 1.5-T whole-body imager using a flexible surface coil. The signs for ligamentous abnormality were as follows: complete or partial discontinuity, increased signal within, and irregularity and waviness of the ligament. The results were compared with operative findings in 18 patients with subsequent surgical repair. Eighteen patients with conservative therapy had a follow-up MR examination after 3 months. There was 1 sprain, 3 partial and 32 complete tears of the anterior talofibular ligament, and 5 sprains, 5 partial, and 7 complete tears of the calcaneofibular ligament. There were no lesions of the posterior talofibular ligament. Compared with surgery, MRI demonstrated in 18 of 18 cases the exact extent of anterior talofibular ligament injuries and underestimated the extent in 2 of 8 cases of calcaneofibular ligament injury. In patients with follow-up MRI after conservative therapy, a thickened band-like structure was found along the course of the injured ligament in 17 of 18 cases. The absence of ligament repair after conservative treatment was confirmed during operative revision in one case. The MRI technique allows for grading of the extent of injury of the lateral collateral ligamentous complex after acute ankle strain. It seems to be suitable for monitoring the healing process after conservative-functional treatment of ligament tears.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050703
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  • 4
    Electronic Resource
    Electronic Resource
    MRI of the pulmonary parenchyma (1999)
    Springer
    European radiology 9 (1999), S. 1755-1764 
    Details
    ISSN: 1432-1084
    Keywords: Key words: MRI ; non-proton MRI ; Lung Disease ; Pneumonia ; Atelectasis ; Lung fibrosis ; Pulmonary edema
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Imaging of the pulmonary parenchyma represents a unique challenge for MRI. Limited signal is caused by low proton density, susceptibility artifacts, and physiological motion (cardiac pulsation, respiration). Recently, further improvements in MRI techniques have widened the potential for investigations of pulmonary parenchymal disease. These include very short echo times, ultrafast turbo-spin-echo acquisitions, projection reconstruction technique, breathhold imaging, ECG triggering, contrast agents (perfusion imaging, aerosols), sodium imaging, hyperpolarized noble gas imaging, and oxygen enhancement. By using widely available techniques, MRI is helpful in the assessment of (a) acute alveolitic processes in chronic infiltrative lung disease, (b) detection and characterization of pulmonary nodules, (c) detection, characterization, and follow-up of pneumonia, (d) differentiation of obstructive atelectasis from non-obstructive atelectasis and infarctions, and (e) measurements of lung water content. Chronic bronchitis, bronchiectasis, and emphysema are not readily assessable by routine MRI techniques. More sophisticated techniques are under investigation for MR imaging of pulmonary ventilation and perfusion. They represent the beginning of functional MR imaging of the lung which will be established in the future.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050919
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  • 5
    Electronic Resource
    Electronic Resource
    Bone age determination based on the study of the medial extremity of the clavicle (1998)
    Springer
    European radiology 8 (1998), S. 1116-1122 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Clavicle ; Medial clavicular epiphysis ; Computed tomography ; Bone age determination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The development of the medial clavicular epiphysis and its fusion with the clavicular shaft have been a subject of medical research since the second decade of this century. Computed tomography provides the imaging modality of choice in analyzing the maturation process of the sternal end of the clavicle. In a retrospective study, we analyzed normal development in 380 individuals under the age of 30 years. The appearance of an epiphyseal ossification center occurred between ages 11 and 22 years. Partial union was found from age 16 until age 26 years. Complete union was first noted at age 22 years and in 100 % of the sample at age 27 years. Based on these data, age-related standardized age distributions and 95 % reference intervals were calculated. Compared to the experience recorded in the relevant literature, there are several landmarks that show no significant change between different ethnic groups and different periods of publication; these are the onset of ossification, the time span of partial union, and the appearance of complete union. Despite the relatively long time spans of the maturation stages, bone age estimation based on the study of the development of the medial clavicular epiphysis may be a useful tool in forensic age identification in living individuals, especially if the age of the subject is about the end of the second or the beginning of the third decade of life (e. g. in determining the applicability of adult or juvenile penal systems). Another possible use is in identifying human remains whose age is estimated at under 30 years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050518
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  • 6
    Electronic Resource
    Electronic Resource
    Hyperplastic callus formation in osteogenesis imperfecta: CT and MRI findings (1998)
    Springer
    European radiology 8 (1998), S. 1137-1139 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Osteogenesis imperfecta ; Hyperplastic callus formation ; Bones ; CT ; Bones ; MR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Hyperplastic callus formation is a noteworthy condition in patients with osteogenesis imperfecta because it often mimicks osteosarcoma on radiography. The findings of CT and MRI in hyperplastic callus formation have not been reported. In the presented case, MRI demonstrated contrast enhancement and edema of the surrounding soft tisssue, consistent with benign as well as malignant disease. Computed tomography showed a calcified rim of the lesion which may be a useful feature to rule out osteosarcoma in this condition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050521
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  • 7
    Electronic Resource
    Electronic Resource
    Hypothenar hammer syndrome in sports (1996)
    Springer
    Knee surgery, sports traumatology, arthroscopy 4 (1996), S. 167-170 
    Details
    ISSN: 1433-7347
    Keywords: Hypothenar hammer syndrome ; Distal ulnar artery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Sports Science
    Notes: Abstract Repetitive blunt trauma or single severe trauma to the hypothenar region may lead to traumatic thrombosis of the distal ulnar artery (hypothenar hammer syndrome, HHS). In the sports-related literature we found and analysed isolated cases attributed to injuries sustained during sporting activities such as baseball, badminton, handball, football, frisbee, softball, karate, weight-lifting and hockey. Further, we report the case of an amateur golf player with ischaemic symptoms of his left hand, where angiography revealed filling defects in the digital arteries associated with a corkscrew-like configuration of the distal ulnar artery. Magnetic resonance imaging (MRI) scan demonstrated, at the level of the hamulus ossis hamati, accessory fibres of m. palmaris brevis forming a sling around the ulnar artery. Treatment by resection of the ulnar artery. Treatment by resection of the thrombosed a. ulnaris segment and replacement with an autologous vein graft resulted in complete relief of symptoms. Histological sections revealed partially organized thrombi adherent to the intimal surface with fragmentation of the internal elastic membrane, indicating a traumatic genesis. As the mechanism of injury, we suspected intensive golf playing with the grip style and subsequent motions leading to pressure injury of the hypothenar area and the underlying ulnar artery. Contraction of the anomalous muscle belly may have additionally compressed the artery, slowing down the arterial flow and promoting thrombosis. In most reported cases including our own, it took a relatively long time until the cause of the disease as traumatic was found and accepted. The initial repetitive blunt or single severe trauma initiaing the HHS can easily be overlloked or ignored. After intimal damage of a. ulnaris, the beginning of symptoms may be prolonged and mislead one into thinking the cause is a collagen or vasospastic disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01577412
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  • 8
    Electronic Resource
    Electronic Resource
    Intraoperative Flußmessung koronarer Bypassgefäße mit der Ultraschall-Transit-Zeit-Methode (1999)
    Springer
    Zeitschrift für Kardiologie 88 (1999), S. 773-779 
    Details
    ISSN: 1435-1285
    Keywords: Key words Coronary artery bypass grafting – coronary flow – transit time flowmeter ; Schlüsselwörter Aortokoronare Bypassoperation – Koronarfluß– Ultraschall-Transit-Zeit-Methode
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Ziel der Studie war es zu untersuchen, ob typische Flußcharakteristika für A.-mammaria-Bypassgefäße zum Ramus interventricularis (IMA) und venöse Bypassgefäße zu Zielgefäßen der Lateral- und Hinterwand des Herzens bestehen (ACVB). Bei 21 Patienten wurden insgesamt 25 Bypassgefäße untersucht (12/25 IMA, 13/25 ACVB). Mit der Ultraschall-Transit-Zeit-Methode wurden für 60 s Flußdaten mit einer zeitlichen Auflösung von 5 ms akquiriert. Signifikante Unterschiede zeigten sich bei den Flußmustern der beiden Bypasstypen. Die A.-mammaria-Bypassgefäße wiesen nur eine Flußspitze nach im Mittel 45,5±18,6& ihres systolisch-diastolischen Zyklus auf. Bei den venösen Bypassgefäßen traten zwei Flußspitzen auf, eine nach 22,1±12,3% und eine nach 63,4±15,5% des systolisch-diastolischen Zyklus. Der Vergleich der beiden Bypasstypen zeigte keinen Unterschied hinsichtlich des mittleren Flusses (IMA-Bypassgefäße: 41,8±26,7 ml/min vs. ACVB: 45,3±27,0 ml/min, p = n. s.) und des maximalen Fllusses (IMA-Bypassgefäße: 75,7±55,4 ml/min vs. ACVB: 98,4±45,2 ml/min, p = n. s.). A.-mammaria-Bypassgefäße zum RIVA zeigten nur eine Flußspitze nach 45% ihres Zyklus. Venöse Bypassgefäße zu Zielgefäßen der Lateral- und Hinterwand des Herzens hatten zwei Flußspitzen, eine nach 22% und eine nach 63% ihres Zyklus. Der mittlere und maximale Fluß war in beiden Bypasstypen nicht unterschiedlich.
    Notes: Summary The aim of the study was to compare the mean and maximum flow and the flow pattern of coronary vein grafts (SVG) supplying target vessels of the inferior and lateral wall with internal mammary (IMA) grafts to the left anterior descending artery (LAD). In 21 patients 25 bypass grafts (13/25 SVG, 12/25 IMA) were investigated. Using the transit time ultrasound method, flow was measured every 5 ms and the flow data of 60 s were acquired. The flow pattern showed significant differences between both graft types during their cycle. IMA grafts showed only one peak occurring after 22.1±12.3% and the second after 63.4±15.5% of their cycle. The mean flow was not different in both graft types (IMA: 45.3±27.0 ml/min and SVG: 41.8±26.7 ml/min, p = n. s.) as it was the case for the maximum flow (IMS: 98.4±45.2 ml/min and SVG: 75.7±55.4 ml/min, p = n. s.). In conclusion, there is a different flow pattern for both graft types concerning the number and the occurrence of flow-peaks in the bypass cycle. The mean and peak flow showed no significant difference.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003920050351
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  • 9
    Electronic Resource
    Electronic Resource
    Die akute Gefäßperforation mit Shuntbildung in den rechten Ventrikel nach perkutaner transluminaler Koronarangioplastie. Kernspintomographischer und dopplersonographischer Nachweis des Shuntflusses (1998)
    Springer
    Zeitschrift für Kardiologie 87 (1998), S. 553-559 
    Details
    ISSN: 1435-1285
    Keywords: Schlüsselwörter Koronarangioplastie – Koronararterienperforation – Kernspintomographie – Dopplerechokardiograhpie – Shunt ; Key words Coronary angioplasty – coronary artery perforation – magnetic resonance imaging – doppler echocardiography – shunt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary A coronary artery perforation is a rare complication after percutaneous transluminal coronary angioplasty. The therapy will be determined by the hemodynamic failure of the left or right ventricle. A case of a coronary artery perforation with a shunt from the right coronary artery to the right ventricle after coronary angioplasty is reported. The shunt was detected by coronary angiography and confirmed by magnetic resonance imaging and doppler echocardiograpy.
    Notes: Zusammenfassung Die Gefäßperforation nach transluminaler Koronarangioplastie (PTCA) stellt eine seltene Komplikation dieser etablierten Behandlungsmethode dar. Die Therapie wird bestimmt durch die hämodynamische Beeinträchtigung des linken oder rechten Ventrikels. Wir berichten über den Fall einer Gefäßperforation nach PTCA mit Shuntbildung von der rechten Koronararterie in den rechten Ventrikel, wobei der Shuntfluß sowohl kernspintomographisch als auch dopplersonographisch dargestellt werden konnte.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003920050214
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  • 10
    Electronic Resource
    Electronic Resource
    Depiction of anomalous coronary vessels and their relation to the great arteries by magnetic resonance angiography (2000)
    Springer
    European radiology 10 (2000), S. 1855-1857 
    Details
    ISSN: 1432-1084
    Keywords: Key words: MR angiography – Coronary artery anomalies – Coronary artery disease – Navigator technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Three-dimensional respiratory-gated coronary MR angiography (MRA) allowed accurate analysis of the anatomy of the coronary arteries and their relation to the adjacent anatomic structures in two patients with anomalous origin and proximal course of the coronary vessels. Together with functional tests, it decisively influenced further therapy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300000506
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