Fig. 3

Nasofrontal encephalocele. (a) (T1-weighted sagittal) and (b) (T1-weighted axial) images show herniation of intracranial content through the nasofrontal suture (fonticulus frontalis) shown by the dotted circle with the frontal bone (open arrow) seen superiorly and nasal bone (long arrow) inferiorly. These bones are identified by their fatty marrow. No herniation is seen through the foramen cecum (labeled C) located anterior to the crista galli (short arrow) which is also identified by its fatty marrow. Note the encephalocele sac (star) is noted anterior to the nasal bone (long arrow). No herniation through the foramen cecum and location anterior to the nasal bone differentiate it from the nasoethmoidal variant. Although all frontoethmoidal encephalocele (nasofrontal, nasoethmoidal, and nasoorbital types) usually herniate through the foramen cecum, in this case of nasofrontal encephalocele, no herniation is seen through the foramen cecum.