CASE HISTORY / CLINIC:
35-year-old female with severe
recurring frontal headaches. No clue of sinusitis or rhinitis could be obtained from history. No abnormalities were found in all the mirror examinations performed. Especially the nose findings were were normal.


FINDINGS:
The frontal sinuses are clear in the coronal CT scan (bony window) but appear very large (especially the right cranial portions).


DIAGNOSIS:
The frontal headache is due to pneumosinus dilatans.

DIFFERENTIAL DIAGNOSIS:
Large frontal sinus on both sides.