Anatomic differentiation of the sella turcica has been greatly improved by introducion of MR over the previously used pneumoencephalography and CT. Because we frequenthy encounter the empty sella in MR imaging, we retrowpectively reviewed and classified 239 incidental empty sellae of 1004 patients who had brain MR. All cases which had initial suspicion of pituitary or hypothalamic lesions were excluded. Although headache is the most common presenting symptom, the associated disease and not specific. The incidence of the empty sella(23.8%) is similar to that reported at autopsy cases increased by the aging process. Therefore, we suggest that empty sella can be a normal variant or a degenerative change.