Diffusion-weighted imaging with calculated apparent diffusion coefficient of enhancing extra-axial masses.

BACKGROUND AND PURPOSE: Sometimes intracranial contrast-enhancing tumors like meningiomas, metastases, lymphomas, and schwannomas can mimic each other. It was the aim of the present study to investigate if intracranial contrast-enhancing lesions can be reliably differentiated with the help of diffusion-weighted imaging with calculated apparent diffusion coefficients (ADCs). METHODS: 29 patients (ages ranging from 22 to 82 years, mean age of 58.6 years) were included. Nine meningiomas, 7 metastases, 6 lymphomas, and 7 schwannomas were investigated. The ADC value in the lesions and in the perifocal edema was analyzed. RESULTS: For the lymphomas, the authors measured the lowest ADC values in the contrast-enhancing part (0.59 +/- 0.09 . 10(-3) mm2/sec). The meningiomas showed a mean ADC value of 0.98 +/- 0.18 . 10(-3) mm2/sec. The schwannomas and metastases showed higher ADC values of 1.33 +/- 0.28 . 10(-3) mm2/sec and 1.05 +/- 0.20 . 10(-3) mm2/sec. The authors saw a statistically significant difference between lymphomas, meningiomas, and metastases concerning the ADC values in the contrast-enhancing part. CONCLUSIONS: In spite of a small sample size and partly a wide range of values, the authors found statistically significant differences between meningiomas, metastases, and lymphomas concerning ADC values. Nevertheless, a differentiation of these lesions only with the help of ADC values seems questionable

[Technique and approach to carotid stenting]

Assuming that the ongoing large randomized controlled trials comparing CAS and endarterectomy support the efficacy and safety of CAS, this method will play a major role in patients with carotid stenosis in the near future. Patient selection, establishing standards of treatment, and systematic training of the interventionist are major issues. This article aims to give an overview of current techniques and devices available in CAS

[Recent studies concerning treatment of acute, ischemic infarcts]

This article gives an overview over past and present studies concerning the acute management of stroke. Stroke trials involving intra-arterial thrombolytic agents, either alone or in combination with other therapies, are described

Overview over past and present studies concerning the acute management of stroke

This article gives an overview over past and present studies concerning the acute management of stroke. Stroke trials involving intra-arterial thrombolytic agents, either alone or in combination with other therapies, are described. © Springer Medizin Verlag 2005

[Sinus and venous thrombosis--differential diagnosis of acute stroke]

Thrombosis of the cerebral veins and sinus is a rare, but important cause of stroke. The clinical picture varies. This contribution addresses the etiology, clinical picture, imaging procedures, and therapeutic options

[Sinus and venous thrombosis--differential diagnosis of acute stroke]

Thrombosis of the cerebral veins and sinus is a rare, but important cause of stroke. The clinical picture varies. This contribution addresses the etiology, clinical picture, imaging procedures, and therapeutic options

[Sinus and venous thrombosis--differential diagnosis of acute stroke]

Thrombosis of the cerebral veins and sinus is a rare, but important cause of stroke. The clinical picture varies. This contribution addresses the etiology, clinical picture, imaging procedures, and therapeutic options