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[Brain CT and MRI findings in fat embolism syndrome]
Abstract:
To elucidate brain CT and MRI findings in fat embolism syndrome (FES), we retrospectively analyzed images from 5 patients with FES during the acute and subacute stages. Brain CT examinations demonstrated brain edema in 2 patients and transient spotty low density lesions in 2 patients. Three patients showed no abnormalities. Brain MRI, however, showed brain abnormalities in all patients during the acute stages. These were revealed as spotty high signal intensity lesions on T2WI, and some showed low intensity on T1WI. These spotty lesions were considered to reflect edematous fluid occurring as a result of the unique pathophysiological condition of FES. While the spotty high signal intensity lesions on T2WI were distributed in the cerebrum, cerebellum, brain stem, thalamus, basal ganglia, internal capsule and corpus callosum, cerebral and cerebellar spotty lesions were characteristically located along the boundary zones of the major vascular territories. This characteristic location might be induced by a hypoxic brain condition in FES because the numerous fat globules present in this condition can block entire brain capillaries. This characteristic signal location on T2WI is a useful indicator for differentiating FES from the primary intra-axial brain injury in patients with multifocal trauma.
Insights
Brain MRI reveals characteristic lesions in fat embolism syndrome (FES), aiding diagnosis. These findings help differentiate FES from other brain injuries in trauma patients.
Area of Science:
- Radiology
- Neurology
- Pathophysiology
Background:
- Fat embolism syndrome (FES) is a potentially serious complication following trauma or surgery.
- Brain imaging is crucial for diagnosing FES, but characteristic findings require elucidation.
Purpose of the Study:
- To describe and analyze brain computed tomography (CT) and magnetic resonance imaging (MRI) findings in patients with FES.
- To identify imaging features that can help differentiate FES from other intra-axial brain injuries.
Main Methods:
- Retrospective analysis of brain CT and MRI scans from 5 patients diagnosed with FES.
- Evaluation of imaging during acute and subacute stages of the syndrome.
Main Results:
- Brain CT showed subtle findings like edema or transient lesions in some patients, with 3 showing no abnormalities.
- Brain MRI revealed abnormalities in all patients during the acute stage, characterized by spotty T2-weighted hyperintensities and some T1-weighted hypointensities.
- Lesions were distributed throughout the brain, notably in vascular boundary zones, suggesting hypoxic injury due to capillary blockage by fat globules.
Conclusions:
- Brain MRI demonstrates characteristic spotty lesions in FES, reflecting edematous changes.
- The characteristic distribution of lesions, particularly in vascular boundary zones, is a key indicator for differentiating FES from primary brain injuries in trauma settings.