Purpose : The purpose of this study is to evaluate the signal intensity and size of anterior pituitary glandin postpartum women, and to dompare with those of control group. Materials and Methods : In 34 postpartum women(18-43 years, mean:27 years) and another 35 control nonpregnant women (20-29 years, mean:24 years), mididsagittalT1-weighted MR images were obtained. The signal intensity and height of the anterior pituitary gland were comparedbetween the post-partum and normal control groups. Results : In postpartum women, the signal intensity of theanterior pituitary gland relative to the pons was higher than that of the control gorup. Pituitary gland height ofpostpartum women was higher (5-11, 8mm, mean:8.18$pm$1.8mm) than that of control group (2-9mm, mean:6.2$pm$1.7mm).Conclusion : It is concluded that the hyperintensith of the anterior pituitary gland on T1-weighted image is anormal finding in postpartum women, which is useful in differentiation from pituitary abnormality.