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  • 1
    Electronic Resource
    Electronic Resource
    The lateral atlanto-dens interval: normal range of asymmetry (1999)
    Springer
    Emergency radiology 6 (1999), S. 290-293 
    Details
    ISSN: 1438-1435
    Keywords: Key words Cervical spine – Computerized tomography – Normal anatomy – Odontoid process
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Purpose: The object of this study is to determine the normal range of asymmetry of the lateral atlanto-dens interval (LADI). Methods: Ninety-nine consecutive patients who had CT scans of the atlanto-axial complex for reasons unrelated to the upper cervical spine were studied. Subjects with a history of cervical trauma or rheumatoid arthritis were excluded. The LADI was measured at a workstation using an electronic cursor. The difference in the LADI between the right and the left side was taken as the measure of asymmetry. Results: The average asymmetry of the LADI was 0.99 ± 1.05 mm. While a number of subjects had symmetrical LADI, the maximum asymmetry in this study population was 5 mm. Conclusion: Asymmetry of the LADI is not unusual in subjects with no symptoms referable to the upper cervical spine. The LADI as a measurement in itself does not signify any type of clinical pathology. The average asymmetry at the middle third of the dens is approximately 1 mm. Ninety-five percent of patients will have an asymmetry of 3 mm or less. The LADI asymmetry is best determined in a CT section that demonstrates the maximal width of the dens. Radiologists and clinicians should be aware of this normal range of asymmetry when interpreting CT scans of the atlanto-axial region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s101400050070
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    MRI of pituitary abscess: two cases and review of the literature (1997)
    Springer
    Neuroradiology 39 (1997), S. 499-503 
    Details
    ISSN: 1432-1920
    Keywords: Key words Pituitary gland ; infection ; abscess ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Pituitary abscesses, rare lesions, may be divided into primary and secondary types. Primary pituitary abscesses occur within a previously healthy gland, while secondary abscesses arise within an existing lesion, such as an adenoma, craniopharyngioma, or Rathke's cleft cyst. Secondary abscesses share radiologic characteristics with the lesions from which they arise. There has been no review of the MRI characteristics of primary pituitary abscesses. We report two cases and review the literature. The typical primary pituitary abscess gives the same or slightly lower signal than brain on T1-weighted images, and could be mistaken for a solid mass or presumed to represent a pituitary adenoma. Contrast-enhanced images are useful, demonstrating absence of central enhancement, suggesting a fluid or necrotic center. In one of our cases, meningeal enhancement was obvious; this has not been reported previously and may be diagnostic, when associated with a rim-enhancing pituitary mass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050453
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Single-shot echo-planar imaging of multiple sclerosis: effects of varying echo time (1999)
    Springer
    Neuroradiology 41 (1999), S. 163-166 
    Details
    ISSN: 1432-1920
    Keywords: Key words Magnetic resonance imaging ; Echo-planar imaging ; Multiple sclerosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Our aim was to determine the relative merits of short and long echo times (TE) with single-shot echo-planar imaging for imaging cerebral lesions such as multiple sclerosis. We examined seven patients with clinically definite multiple sclerosis were imaged at 1.5 T. Patients were scanned with spin-echo, single-shot echo-planar imaging, using TEs of 45, 75, 105, and 135 ms. Region of interest (ROI) measurements were performed on 36 lesions at or above the level of the corona radiata. The mean image contrast (IC) was highest (231.1) for a TE of 45 ms, followed by 75 ms (218.9), 105 ms (217.9), and 135 ms (191.6). When mean contrast-to-noise ratios (C/N) were compared, the value was again highest (29.7) for TE 45 ms, followed by 75 ms (28.9), 105 ms (28.5), and 135 ms (26.3). In a lesion-by-lesion comparison, TE 45 ms had the highest IC and C/N in the largest number of cases (50 % and 47.2 %, respectively). IC and C/N for TE 45 ms were superior to those of 75 ms in 64 % and 58 %, respectively. These results support the use of relatively short TEs for single-shot echo-planar imaging in the setting of cerebral lesions such as multiple sclerosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050724
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    MRI of pituitary hyperplasia in hypothyroidism (1995)
    Springer
    Neuroradiology 38 (1995), S. 50-52 
    Details
    ISSN: 1432-1920
    Keywords: Key words Magnetic resonance imaging ; Pituitary ; Adenoma ; Hyperplasia ; Hypothyroidism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We present a case of a “pseudoprolactinoma” where administration of thyroid hormone resulted in resolution of symptoms and regression of pituitary hyperplasia seen on MRI.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00593219
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    MRI of pituitary hyperplasia in hypothyroidism (1996)
    Springer
    Neuroradiology 38 (1996), S. 50-52 
    Details
    ISSN: 1432-1920
    Keywords: Magnetic resonance imaging ; Pituitary ; Adenoma ; Hyperplasia ; Hypothyroidism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We present a case of a “pseudoprolactinoma” where administration of thyroid hormone resulted in resolution of symptoms and regression of pituitary hyperplasia seen on MRI.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00593219
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Subacute combined degeneration of the spinal cord: MRI detection of preferential involvement of the posterior columns in a child (1995)
    Springer
    Pediatric radiology 25 (1995), S. 140-141 
    Details
    ISSN: 1432-1998
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Subacute combined degeneration of the spinal cord (vitamin B12-deficient myelopathy) is a neurologic disorder manifesting progressive symptoms of paresthesia and spastic paralysis. As shown by pathology, it initially involves the posterior columns of the thoracic cord. We present a case of vitamin B12 deficiency with preferential posterior column involvement of the thoracic cord in a child. Theoretically, this should be the earliest, most reversible stage of the disease, making recognition of this MRI pattern of critical importance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02010329
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    Paper (German National Licenses)
    Fulltext
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