[논문]CT Sign of Brain Swelling without Concomitant Parenchymal Hypoattenuation: Comparison with Diffusion- and Perfusion-weighted MR Imaging

Na, Dong Gyu; Kim, Eung Yeop; Ryoo, Jae Wook; Lee, Kwang Ho; Roh, Hong Gee; Kim, Sam Soo; Song, In Chan; Chang, Kee-Hyun

doi:10.1148/radiol.2353040571

[해외논문] CT Sign of Brain Swelling without Concomitant Parenchymal Hypoattenuation: Comparison with Diffusion- and Perfusion-weighted MR Imaging

Radiology, v.235 no.3, 2005년, pp.992 - 998

Na, Dong Gyu , Kim, Eung Yeop , Ryoo, Jae Wook , Lee, Kwang Ho , Roh, Hong Gee , Kim, Sam Soo , Song, In Chan , Chang, Kee-Hyun

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PURPOSE: To retrospectively evaluate the apparent diffusion coefficient (ADC) on magnetic resonance (MR) images and the perfusion parameters of lesions that show brain swelling without concomitant parenchymal hypoattenuation on computed tomographic (CT) scans. MATERIALS AND METHODS: Review board approval was obtained, and informed consent was waived. A total of 14 patients (seven men and seven women; mean age, 64 years +/- 11) were retrospectively selected from the consecutive 172 patients with acute cerebral ischemia who underwent CT within 6 hours of symptom onset. All patients had brain swelling without parenchymal hypoattenuation, including loss of gray-white matter distinction on CT scans, and they underwent diffusion- and perfusion-weighted MR imaging shortly after CT. CT attenuation, ADC, and perfusion parameters of relative cerebral blood volume (CBV), time to peak (TTP), and relative cerebral blood flow (CBF) were calculated for gray and white matter of the lesion. The measured values were compared with those of the contralateral hemisphere by using the paired t test; comparison of values of perfusion parameters among three subgroups was performed with the Kruskal-Wallis test. Arterial occlusions were determined with MR angiography or conventional angiography. RESULTS: The mean interval between initial CT and MR imaging was 2.4 hours +/- 0.9 (range, 0.4-3.4 hours). The ADC of lesions was similar to that of contralateral normal tissue (mean ADC ratio for gray matter and white matter, 0.99 and 0.97, respectively) (P > .05). Lesions had an increased relative CBV (P < .001), a mild to moderate TTP delay (P .05). Proximal cerebral artery occlusions were found in all patients. In five (36%) patients, the lesion did not progress to infarction at follow-up. CONCLUSION: The CT sign of brain swelling without concomitant parenchymal hypoattenuation in patients with acute cerebral ischemia does not represent severe ischemic damage and may suggest ischemic penumbral or oligemic tissue.

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[해외논문] CT Sign of Brain Swelling without Concomitant Parenchymal Hypoattenuation: Comparison with Diffusion- and Perfusion-weighted MR Imaging

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[해외논문] CT Sign of Brain Swelling without Concomitant Parenchymal Hypoattenuation: Comparison with Diffusion- and Perfusion-weighted MR Imaging

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