Radiological analysis was done on hysterosalpingogram acquired from 100 cases of sterility in Seoul Red Cross Hospital during about 2 years since June, 1975. The results are following: 1. Uterine size a. Width (distance between cornual sphincters) (cm) Range: 2.0∼5.9, Median: 3.6 b. Length (from center of fundus to upper border of isthmus) (cm) Range: 1.9∼5.9, Median: 3.8 2. Margin of uterine cavity Convex Concave Straight a. Funds 11 (cases) 52 37 b. Right 13 79 8 c. Left 17 72 11 3. Depth of fundal concavity a. less than 1.0cm (Normal) b. 1.0∼1.5cm (Arcuate uterus) c. 1.6∼3.5cm (Bicornuate uterus) (Septate uterus) 4. Pretubal bulging Visualized in 44 cases a. Bilateral 35 cases b. Unilateral 9 cases 5. Fallopian tube a. Obstructed in 42 cases unilateral in 10 cases bilateral in 32 cases b. Site of obstruction Proximal 15, Middle 12, Distal 47 6. Twelve cases of extravassation from fallopian tube were all in obstructed ones 7. Extravasation from uterine cavity is not related with obstruction of fallopian tube