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  • 1
    Electronic Resource
    Electronic Resource
    Solitary plasmacytomas of the occipital bone: a report of two cases (1997)
    Springer
    European radiology 7 (1997), S. 503-506 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Skull ; Occipital bone ; Plasmacytoma ; CT ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The radiological appearances of two cases of solitary plasmacytoma in the occipital bone are described. One arose in the lateral part and the other in the squama. They showed characteristic radiological features on CT, MRI and angiography. Bone scintigraphy and gallium scintigraphy were also available. Solitary plasmacytoma of the skull is a rare condition and usually occurs in the calvarium. The skull base is an extremely rare site and only four cases have been reported. The literature of solitary plasmacytoma of the skull is reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050192
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Diffusion-weighted echo-planar MR imaging in differential diagnosis of brain tumors and tumor-like conditions (2000)
    Springer
    European radiology 10 (2000), S. 1342-1350 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Brain ; MRI ; Neoplasms ; Diffusion image ; Echo-planar MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. We assess diffusion-weighted MR images in the differential diagnosis of intracranial brain tumors and tumor-like conditions. Heavily diffusion-weighted (b = 1100 or 1200 s/mm2) axial images were obtained with single-shot echo-planar technique in 93 patients with pathologically confirmed various intracranial tumors and tumor-like conditions with diffusion gradient perpendicular to the images. We compared signal intensity of the lesions with those of gray and white matter, and cerebrospinal fluid (CSF). In 29 cases (31.1 %) the lesions were isointense to gray and/or white matter. However, 5 cases (5.4 %) showed extremely increased signal intensity: two epidermoid cysts; two chordomas; and one brain abscess. The entire portion of a tumor was markedly hyperintense in 10 cases (10.8 %): four malignant lymphomas; four medulloblastomas; one germinoma; and one pineoblastoma. A CSF-like hypointense signal was seen in many cystic tumors, and cystic or necrotic portions of tumors. A neurosarcoid granulation was the only solid lesion showing characteristically a hypointense signal like CSF. The combination of markedly hyperintense and hypointense signals was seen generally in hemorrhagic tumors. Diffusion-weighted echo-planar MR imaging is useful in the differential diagnosis of brain tumors and tumor-like conditions, and suggests specific histological diagnosis in some cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003309900310
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Development of fat within a meningioma (1996)
    Springer
    Neuroradiology 38 (1996), S. 214-216 
    Details
    ISSN: 1432-1920
    Keywords: Key words Meningioma ; Intratumoral fat ; Computed tomography ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report a tentorial meningioma containing fat. Multiple areas of fatty density or intensity in the tumour were seen on CT and MRI, which corresponded histologically to lipomatous components. CT 10 years previously had demonstrated a smaller tumour without evidence of fatty components. We found only five cases in the literature in which fatty density was demonstrated within a meningioma on CT and a lipomatous component histologically proved. Xanthomatous change, with lipid in tumour cells, causes decrease in density on CT, but not to the levels of fat. As both lipomatous components and xanthomatous change show similar intensity on MRI, CT can be helpful in differentiating these two conditions. To our knowledge, our case is the only one in which the advent of fatty tissue was confirmed during follow-up.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00596531
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  • 4
    Electronic Resource
    Electronic Resource
    Development of fat within a meningioma (1996)
    Springer
    Neuroradiology 38 (1996), S. 214-216 
    Details
    ISSN: 1432-1920
    Keywords: Meningioma ; Intratumoral fat ; Computed tomography ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report a tentorial meningioma containing fat. Multiple areas of fatty density or intensity in the tumour were seen on CT and MRI, which corresponded histologically to lipomatous components. CT 10 years previously had demonstrated a smaller tumour without evidence of fatty components. We found only five cases in the literature in which fatty density was demonstrated within a meningioma on CT and a lipomatous component histologically proved. Xanthomatous change, with lipid in tumour cells, causes decrease in density on CT, but not to the levels of fat. As both lipomatous components and xanthomatous change show similar intensity on MRI, CT can be helpful in differentiating these two conditions. To our knowledge, our case is the only one in which the advent of fatty tissue was confirmed during follow-up.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00596531
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    MRI of enlarged endolymphatic sacs in the large vestibular aqueduct syndrome (1998)
    Springer
    Neuroradiology 40 (1998), S. 167-172 
    Details
    ISSN: 1432-1920
    Keywords: Key words Inner ear ; Aqueduct ; vestibular ; Endolymphatic duct ; Hearing loss ; Computed tomography ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We studied ten inner ears of five patients with a bilateral large vestibular aqueduct syndrome, using CT and MRI. Although the large vestibular aqueduct varied in size, a markedly dilated endolymphatic sac extending to the sigmoid sinus was demonstrated bilaterally on MRI in all patients. The cause of hearing loss in this syndrome is unclear. However, it is suggested that reflux of the protein-rich, hyperosmolar endolymph from the enlarged endolymphatic sac (EES) into the cochlea through a widely patent endolymphatic duct may damage the neuroepithelium. CT density and spin-echo MRI signal intensity of the endolymph in EES were markedly higher than those of CSF in eight inner ears of four patients. Increased density and high signal may indicate protein-rich, hyperosmolar endolymph. In some patients with sensorineural hearing loss and EES, the vestibular aqueduct may not appear dilated on CT. MRI is therefore necessary for correct diagnosis of this syndrome, which should more correctly be termed “large endolymphatic duct and sac syndrome”. Prominent EES may predict poor prognosis in this syndrome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050561
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  • 6
    Electronic Resource
    Electronic Resource
    Imaging of calvarial eosinophil granuloma (1999)
    Springer
    Neuroradiology 41 (1999), S. 723-728 
    Details
    ISSN: 1432-1920
    Keywords: Key words Skull ; Eosinophilic granuloma ; Histiocytosis Langerhans-cell ; Computed tomography ; Magnetic resonance imaging ; Scintigraphy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We reviewed the imaging of four pathologically proven calvarial eosinophil granulomas. The diameter of the lesions ranged from 13 to 40 mm; three were biconvex, but the other had a collar-stud appearance. Two lesions were in the frontal and two in the parietal bone. On bone-window CT, a bevelled edge was seen in three cases and button sequestration in one, but no sclerotic rim was shown. Although one lesion had a low-density area, the lesions were slightly denser than grey matter. They were isointense with grey or white matter on T1-weighted MRI and gave heterogeneous high signal on proton-density and T2-weighted images. All enhanced markedly, with a less strongly enhancing portion within them. A tail of dural enhancement and reactive change in the overlying galea or temporal muscle were seen in all cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050831
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    Paper (German National Licenses)
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