Diagnostic Approach to Medial Temporal Lobe Enhancement on Brain MRI

Common Causes and Diagnostic Considerations

Cerebral venous thrombosis, particularly involving cortical veins in the temporal region, can present with enhancement of the medial temporal lobe due to venous congestion and blood-brain barrier disruption, according to the American Heart Association 1
Isolated cortical vein thrombosis may present with ipsilateral dural enhancement and thickening in the affected region, as noted by the World Federation of Neurosurgical Societies 2, 3
Developmental venous anomalies or capillary telangiectasias can show enhancement patterns that might be confused with pathological enhancement, as reported in the journal Brain 4
Amyloid-related imaging abnormalities can present with enhancement in various brain regions, including the temporal lobes, according to the Alzheimer's Association 5
Multiple sclerosis lesions may show nodular or ring enhancement, though typically these are not limited to the medial temporal lobe, as stated by the National Multiple Sclerosis Society 4
The American College of Radiology recommends considering alternative or additional pathology when enhancement is seen in the setting of known or suspected dementia 7

Contrast-enhanced MRI with MR venography should be performed to evaluate for cerebral venous thrombosis, as recommended by the American Heart Association 1
Diffusion-weighted imaging can help differentiate between vascular and non-vascular causes of medial temporal lobe enhancement, according to the American Society of Neuroradiology 1
Susceptibility-weighted imaging can detect microhemorrhages or venous abnormalities, as reported by the International Society for Magnetic Resonance in Medicine 5

If enhancement is associated with absence of flow void in venous structures, consider cerebral venous thrombosis, as advised by the American Heart Association 1
Urgent anticoagulation therapy may be indicated to prevent intracranial hemorrhage and improve outcomes in cases of cerebral venous thrombosis, according to the World Federation of Neurosurgical Societies 2, 3
Enhancement associated with clinical symptoms such as headache, seizures, or focal neurological deficits requires immediate evaluation, as recommended by the American Academy of Neurology 2, 3