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Reversible MR Changes in the Cat Brain after Cerebral Fat Embolism Induced by Triolein Emulsion

Chang H. Leeb, Hak J. Kima,b, Hae G. Kimc,b, Sang D. Leed,b, Suk M. Sone,b, Yong W. Kimf,b, Seung M. Kima,b and Choong K. Euna,b

a Department of Radiology, Pusan National University College of Medicine, Pusan National University Hospital, Pusan, South Korea
b Department of Pathology, Pusan National University College of Medicine, Pusan National University Hospital, Pusan, South Korea
c Department of Anesthesiology, Pusan National University College of Medicine, Pusan National University Hospital, Pusan, South Korea
d Department of Urology, Pusan National University College of Medicine, Pusan National University Hospital, Pusan, South Korea
e Department of Internal Medicine, Pusan National University College of Medicine, Pusan National University Hospital, Pusan, South Korea
f the Department of Radiology, Inje University College of Medicine, Pusan, South Korea



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  		FIG 1. Fat globules.

A, Photomicrograph of the fat emulsion. The fat globules are of variable size, mostly less than two times the size of red blood cells (arrow, original magnification x40).

B, An intravascular fat globule is pinkish-red on oil red O staining (original magnification x200).



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  		FIG 2. Images obtained in a cat in group 4: A indicates T2WIs; B, Gd-enhanced T1WIs; C, DWIs; D, ADC maps; E, light photomicrograph; F, electron photomicrograph. 1 indicates 1 hour after embolization; 2, 1 day; and 3, 7 days. At 1 hour, the embolized lesion in the left hemisphere appears hyperintense in A1, enhanced in B1, mildly hyperintense in C1, and isointense in D1. At 1 day, T2WI hyperintensity (A2) and contrast enhancement (B2) are substantially decreased and not evident at day 7 (A3, B3). After day 1, DWIs (C2, C3) and ADC maps (D2, D3) reveal isointensity of the lesion. In E, Light microscopy of the gray matter (top) and white matter (bottom) shows no evidence of demyelination (Luxol fast blue stain, original magnification x100). In F, Electron microscopy of the gray matter shows no evidence of neuropil or interstitial swelling (original magnification x3000).





Copyright © 2008 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X