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  • 1
    Electronic Resource
    Electronic Resource
    MRI of giant cell tumor of tendon sheath of the hand: a report of three cases (1995)
    Springer
    European radiology 5 (1995), S. 467-470 
    Details
    ISSN: 1432-1084
    Keywords: MRI ; Tendons ; Giant cell tumors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Giant cell tumor of tendon sheath is a common tumor of the hand. Magnetic resonance can be used to confirm its presence, as well as characterize and determine its extent, contributing to the presurgical diagnosis, planning of the surgical approach, and diagnosis of recurrence. The authors describe the MR appearances in three cases, using spin-echo sequences with and without fat saturation and intravenous gadopentetate dimeglumine administration. Previous literature on the subject is also reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00184965
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Assessing radiographically occult upper extremity fractures with dedicated extremity MRI (2000)
    Springer
    Emergency radiology 7 (2000), S. 339-348 
    Details
    ISSN: 1438-1435
    Keywords: Key words Magnetic resonance imaging, low-field-strength imaging – Extremities, MR – Fractures, MR – Trauma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Purpose: To examine the utility of low-field, dedicated extremity MRI for assessing acute upper extremity trauma in patients with radiographs that are negative for fracture. Secondly, to determine which sequences are most useful when screening for fractures. Methods: Forty-four of 46 patients with acute upper extremity trauma and initial radiographs negative for fracture were imaged with a 0.2-T MRI system. Findings were verified with follow-up clinical assessment and plain radiography. Results: In 21 patients, dedicated extremity MRI demonstrated 26 ultimately proven occult fractures, none of which were seen on the initial conventional radiographs. True fractures demonstrated marrow edema and a linear fracture line on low-field MRI. One bone contusion showed edema with no fracture line and was misdiagnosed as a fracture. Low-field MRI correctly identified 23 remaining patients with no fracture. Sensitivity and specificity for fracture in the 44 patients successfully imaged were 100 % and 96 %, respectively. Additionally, 21 soft-tissue injuries were found incidentally by MRI. However, these may not merely be incidental findings of an acute nature, but may very well be chronic, and therefore merit no specific treatment. T1-weighted gradient-echo and short-tau inversion recovery sequences demonstrated the fracture line and marrow edema to best advantage, and were thus the most useful sequences to assess fractures on low-field MRI. Conclusion: Extremity MRI is highly sensitive and specific for radiographically occult fractures of the upper extremity and can also identify associated soft-tissue injuries. In our study, the management was altered in 45 % of the patients following MRI. When adequate sequences are used this modality can direct appropriate therapy while obviating the added expense and morbidity of unnecessary immobilization and follow-up imaging of patients without fracture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00011854
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic resonance imaging of labral cysts of the hip (1996)
    Springer
    Skeletal radiology 25 (1996), S. 733-737 
    Details
    ISSN: 1432-2161
    Keywords: Key words Hip ; abnormalities ; Hip ; magnetic resonance ; Hip ; radiographs ; Hip ; labrum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. To present the magnetic resonance (MR) imaging findings in patients with labral cysts adjacent to the acetabulum and to examine their association with hip pathology. Design. MR images and conventional radiographs of seven patients with paralabral cysts were retrospectively reviewed by three musculoskeletal radiologists. Patients. The patients included three men and four women with hip pain, ranging in age from 29 to 82 years. Two patients had developmental dysplasia of the hip and six had a history of remote trauma/dislocation. Clinical history and follow-up were obtained in all patients. Surgery was performed on one patient. Results and conclusions. Paralabral cysts were located in the posterosuperior aspect of the hip joint in five patients and in the anterior aspect in two patients. A tear of the adjacent acetabular labrum was confirmed surgically in one patient, and in all patients the MR features suggested the presence of an abnormal labrum. Osteoarthritis was observed in three patients and there was associated subchondral cyst formation in the acetabulum adjacent to the cyst in three patients. The paralabral cyst of the hip is well visualized on MR imaging and is seen in patients with a predisposition to labral pathology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002560050170
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Tumoral calcinosis: radiologic-pathologic correlation (1995)
    Springer
    Skeletal radiology 24 (1995), S. 573-578 
    Details
    ISSN: 1432-2161
    Keywords: Tumoral calcinosis ; Soft tissue calcification ; Periarticular calcification ; Metastatic calcification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Objective Tumoral calcinosis is a frequently misdiagnosed disorder. This study details the radiologic and pathologic characteristics of tumoral calcinosis that distinguish it from most other entities. Design Radiologic and pathologic findings, and medical records of 12 patients with tumoral calcinosis were reviewed and compared with equivalent information about 5 patients with other calcified lesions. Patients The 12 patients ranged in age from 15 months to 62 years. Six had idiopathic tumoral calcinosis and 6 had secondary tumoral calcinosis. Results and conclusions A consistent radiologic finding for tumoral calcinosis was a dense calcified mass that was homogeneous except for a “chicken wire” pattern of lucencies, which correlated histologically with thin fibrous septae. Other characteristics of tumoral calcinosis included fluid-calcium levels, demonstrated in four patients, and smooth osseous erosions adjacent to the mass, demonstrated in three patients. Five cases of tumoral calcinosis were originally confused with other calcified lesions; however, the radiologic findings were characteristic of tumoral calcinosis in retrospect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00204854
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Fibrogenesis imperfecta ossium: imaging correlation in three new patients (1999)
    Springer
    Skeletal radiology 28 (1999), S. 390-395 
    Details
    ISSN: 1432-2161
    Keywords: Key words Fibrogenesis imperfecta ossium ; Radiographs ; MR imaging ; Osteomalacia ; Metabolic bone disorder ; Collagen disorder
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. Fibrogenesis imperfecta ossium is an extremely rare disorder that can easily be misdiagnosed. We retrospectively reviewed the clinical and imaging data of three confirmed cases of fibrogenesis imperfecta. Design and patients. The patients consisted of two men and one woman, ranging in age from 40 to 53 years. Radiography was performed in all the patients. One patient had a 3-year follow-up of the thoracolumbar spine with conventional radiography and thoracolumbar magnetic resonance (MR) imaging. Open biopsy was performed in all cases, confirming the diagnosis of fibrogenesis imperfecta ossium. Results. All our cases demonstrated ”fishnet” trabecular pattern by conventional radiographs, and a pelvis radiograph of one patient showed an equivocal sclerosis pattern. Multiple fractures were noted in two patients. A pseudoexostosis was present in the ilium in one patient. Thoracolumbar MR imaging demonstrated diffuse low signal intensity within the medullary space on both T1-weighed and T2-weighted images, except for a region of increased signal intensity in the L1 and L2 vertebral bodies on T2-weighed images due to edema from acute collapse. Conclusions. Although uncommon, fibrogenesis imperfecta ossium should be considered in a previously healthy patient with a combination of progressive bone pain, unexplained fractures, a radiologic pattern of fishnet osteopenia and MR imaging of low signal intensity bone marrow on both T1-weighted and T2-weighted images.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002560050535
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  • 6
    Electronic Resource
    Electronic Resource
    MR imaging of clear cell sarcoma (malignant melanoma of the soft parts): a multicenter correlative MRI-pathology study of 21 cases and literature review (2000)
    Springer
    Skeletal radiology 29 (2000), S. 187-195 
    Details
    ISSN: 1432-2161
    Keywords: Key words Clear cell sarcoma ; Malignant melanoma of soft parts ; MRI ; Magnetic resonance ; Neoplasm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. To evaluate MR imaging and pathology findings in order to define the characteristic features of clear cell sarcoma of the soft tissues (malignant melanoma of the soft parts). Design and patients. MR examinations of 21 patients with histologically proven clear cell sarcoma of the musculoskeletal system were retrospectively reviewed and assessed for shape, homogeneity, delineation, signal intensities on T1- and T2-weighted images, contrast enhancement, relationship with adjacent fascia or tendon, secondary bone involvement, and intratumoral necrosis. In 19 cases the pathology findings were available for review and for a comparative MR-pathology study. Results. On T1-weighted images, lesions were isointense (n=3), hypointense (n=7) or slightly hyperintense to muscle (n=11). Immunohistochemical examination was performed in 17 patients. All 17 specimens showed positivity for HMB-45 antibody. In nine of 11 lesions with slightly increased signal intensity on T1-weighted images, a correlative MR imaging-pathology study was possible. All nine were positive to HMB-45 antibody. Conclusions. Clear cell sarcoma of the musculoskeletal system often has a benign-looking appearance on MR images. In up to 52% of patients, this lesion with melanocytic differentiation has slightly increased signal intensity on T1-weighted images compared with muscle. As the presence of this relative higher signal intensity on T1-weighted images is rather specific for tumors displaying melanocytic differentiation, radiologists should familiarize themselves with this rare entity and include it in their differential diagnosis when confronted with a well-defined, homogeneous, strongly enhancing mass with slightly higher signal intensity compared with muscle on native T1-weighted images.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002560050592
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    Paper (German National Licenses)
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