[Magnetic resonance imaging of intracerebral hemorrhage].
Computerized tomography (CT) followed with magnetic resonance imaging (MRI) several years later enabled first the direct visualization of extravascular blood and products of it's degradation. Protein component of hemoglobin is from over 90% responsible for the hyperdensity of CT image in case of a hemorrhage, whereas paramagnetic properties of hemoglobin derivates are responsible for signal changes in MRI. CT is capable to diagnose accurately just an acute hemorrhage. It changes towards hypodensity in 3 weeks with posthemorrhagic pseudocyst as a final result that has rather low specificity. Differentiation from contusion, ischemic lesion or even astrocytoma may be difficult. CT has thus "short memory" for hemorrhage. MRI can differentiate 5 stages of hemorrhage according to the time schedule: hyperacute, acute, subacute stage I, subacute stage II and chronic. Sequel of a hemorrhage is detectable even years after the hemorrhagic event. The development of intracranial hemorrhage in daily routine MR imaging is described and documented to serve as a guide of model situation for the use of physician.
Seidl
Z
Z
Radiodiagnostická klinika 1, LF UK a VFN, Praha.
Obenberger
J
J
Viták
T
T
D001921:Brain / Q000473:pathology; D002543:Cerebral Hemorrhage / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D008279:Magnetic Resonance Imaging; D014057:Tomography, X-Ray Computed
Intracerebrální krvácení v obraze magnetické rezonance.