Female, 23 years old, with headache and pseudotumor cerebri, question of left frontal encephalocele seen on outside sinus CT. The left frontal bone lesion in question correlates to a small CSF filled defect within the inner table of the frontal bone. A venous structure enters into this defect, but no involvement of the brain parenchyma is seen.The brain parenchyma as visualized on this examination is within normal limits. No pathologic enhancement is seen. Incidental note is made of a cavum vellum interpositum. The pituitary gland is slightly small in size for a patient of this age.
1.The lesion in question within the left frontal bone most likely represents a small pacchionian granulation or some other small developmental osseous anomaly. No evidence of encephalocele is seen.2.The pituitary gland is slightly small for a patient of this age. Findings may reflect normal anatomic variation but they could also represent a secondary finding related to elevated intracranial pressure as the history of pseudotumor cerebri would suggest.