Fig. 4

Nasoethmoidal and nasoorbital encephalocele. a (T2-weighted sagittal) image shows herniation of the brain content into the prenasal space through foramen cecum (star) anterior to crista galli (open arrow). Prenasal space is bounded anteriorly by nasal bone (arrowhead) and posteriorly by nasal septum (S). Nasofrontal suture (dotted arrow) is seen between frontal bone (long arrow) and nasal bone (arrowhead). Note that the herniated content has undergone gliosis appearing hyperintense on T2-weighted images with a porencephalic cyst in the adjacent frontal lobe (P). b (T2-weighted coronal) image: Note the nasoorbital extent of this herniated sac (double arrow)