Understanding of the morphology and morbidity of the uterine scars that form following cesarean section is of freat help in preventing possible rupture of the uterus and to select the type of delively on the subsequent pregnancy. The present study has been undertaken to make observation on the uterine changes revealed by hysterogram. The clinical materials were consisted in 44 women who had at least one previous cesarean section, and also in 10 normal parous women after normal vaginal delivery as the control. The hysterogram was performed by Kjellberg`s method employing fractionation of the contrast medium(Lipiodolⓡ 25%) according to Hyam`s recommendation. The following results and conclusions were obstained. 1. Of 44 women with previous cesarean section, 31.8% showed normal hysterofram, In the remain- ing patients, hysterographic abnormalities of various degree were noted. The most frequent type od X-ray changes was a mild outpouching at the site of previous surgery, i.e., isthmus or so-called lower uterine segment(during pregnancy). 2. The deformation of the uterus on husterogram in the patients with multiple cesarean sections was more prominent and marked than in the patients with single operation. 3. There is no relationship between the degree and type of deformation and such periparturient complications as prematured rupture of the membrance, prolonged delivery, post-operative febrile episode (a fever higher than 38℃), or post-operative abdominal infection. On the other hand, all these factorts excepting premature rupture of the membrance seem to have some form of influence on the incidence of the scar formations.