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Type:
Educational Exhibit
Keywords:
Education, MR, CT, CNS, Neuroradiology brain, Haemorrhage
Authors:
T. Cantarelli Rodrigues1, S. Brighenti Bergamaschi1, C. F. R. B. Milito2, C. S. Vergilio1, R. S. de Carvalho3, M. H. Idagawa3; 1São Paulo, SP/BR, 2São Paulo /BR, 3São Paulo/BR
DOI:
10.1594/ecr2014/C-0261
Background
Cerebral microhemorrhages are also known as microbleeds or lacunar hemorrhages.
The cerebral microhemorrhages were defined as multiple foci of ovoid marked loss of signal intensity in weighted sequences in gradient-echo T2*.
Should be differentiated from "flow void" vascular and cerebral calcifications,
and also leptomeningeal hemosiderosis .
Size criteria have been inconsistent.
They are recognized as a marker of microangiopathy and have implications for diagnosis and prognosis.
Imaging techniques: Computerized tomography (CT) without contrast and magnetic resonance imaging (MRI) of the brain.
MRI is the most sensitive method for detection,
particularly the gradient echo sequences - T2 * and ecoplanar - SWI (susceptibility-weighted imaging),
where such injuries present with marked hypointense less than 10mm diameter.
The SWI sequence still allows differentiation of calcification of bleeding.
The greater sensitivity of MRI in the detection,
arises from the "blooming effect" that makes the largest lesion in T2* sequence.