Journal of the Korean Society of Stereotactic and Functional Neurosurgery 2011;7(1):49-53.
Published online June 30, 2011.
Distribution of Incidental Brain Lesions on Brain MRI According to Age and Gender
Byoung Hun Lee, Yong Sook Park, Jeong Taik Kwon, Taek Kyun Nam, Byung Kook Min, Sung Nam Hwang
Department of Neurosurgery, Chung-Ang University Hospital, Seoul, Korea
Abstract
Introduction: Incidental findings on brain imaging are defined as previously undetected abnormalities of potential clinical relevance that are unexpectedly discovered and unrelated to the purpose of the imaging. Incidental findings are increasingly detected in clinical practice with screening. Data on the prevalence of these abnormalities are scarce. We quantified the prevalence of incidental findings on MRI of the brain.
Methods
and Materials: We retrospectively analyzed studies of 4,000 people without neurological symptoms who underwent MRI of the brain between January 2008 and December 2010. The patients divided seven groups by age and five groups by disease categories.
Results
Overall prevalence of incidental brain lesions was 43.5%. The cyst lesions are most common less than 30 years old. Between the ages of 30 and 50, tumors and degenerative vascular disease accounted for a significant proportion. Degenerative vascular diseases increased after the age of 50. Incidental findings which have neurosurgical significance were tumors 5.90%, unruptured aneurysms 4.32% and degenerative vascular disease 28.30%. Regardless of gender, the overall prevalence of tumors increased with age. The aneurysms in both men and women increased after 40 years old.
Conclusion
Incidental findings on brain MRI are common, prevalence increases with age. These findings would be useful as a reference of incidental brain lesions in clinical practice.
Key Words: Incidental finding, Tumor, Aneurysm, Magnetic resonance imaging.
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