Uncommon Locations for Brain Herniations Into Arachnoid Granulations: 5 Cases and Literature Review.

BHAGs are increasingly recognized due to improved spatial resolution in MRIs. While there is still no definitive evidence that these lesions are responsible for various neurologic symptoms, some of these abnormalities may hold clinical significance, such as the visual symptoms seen in 2 of the cases described. BHAG can be associated with gliosis of adjacent brain tissue, which may be a mechanism for symptom development.