The ultrasound is easily available and noninvasive diagnostic method without radiation hazard. We can approach to differential diagnosis of ovarian tumors by gray scale ultrasound which can display the detailed structure of soft tissue. In department of radiology, Korea Veterans Hospital , 27 cases of histologically confirmed ovarian tumors collected from March 1984 to February 1986 were analized. The results were as follows: 1. The age distribution was from 13 to 72 years. 2. The histologic diagnosis of ovarian tumors(27 cases) are as follows ; teratoma(14), mucinous cystadenoma(8), mucinous cystadenocarcinoma(1), serous cystadenoma(2), Krukenburg tumor(1) and malignant thecoma(1). 3. The long diameter of ovarian tumors ranges from 4 cm to 28 cm. In these , mucinous cystadenoma is the largest and their size are as follow ; less than 10 cm : 25%, 11-15cm ; 12%, 16-20 cm ; 25% and more than 20 cm : 38%. 4. the ultrasonographic findings of teratoma(14) were mainly cystic (8) or echogenic(6). There were echogenic solid components showing distal acoustic shadowing or fat-fluid level within cystic masses. Echogenecity of solid masses was heterogenous. 5. The ultrasonographic findings of mucinous cystadenoma & cystadenocarcinoma(9) were unilocular cystic(3) or multilicular cystic(6). There were variable amount of echogenic component within cystic masses. 6. Those of serous cystadenoma (2) were unilocular cystic(1) or multilocular cystic(1). 7. Krukenburg tumor (1) and malignant thecoma(1) were heterogenously echogenic.