Ultrasonography affords an accurate assessment of the presence, size, location and internal consistency of a pelvic mass. We present our experience of 105 cases of pelvic masses in female patients by ultrasonography, and the results are as described: 1. Ultrasonography is nonspecific, however, the possibility of mucinous cystadenoma of ovary, teratoma (dermoid cyst), uterine leiomyoma and trophoblastic disease can be suggested due to their characteristic internal consistency. 2. Thin smooth internal septation seen within mucinous cystadenoma, eccentric solid mural component of dermoid cyst, enlarged uterine wall with lobulated outer margin of leiomyoma, and yesicular appearance of trophoblastic disease were the specific sonographic features. 3. Loculated ascites and hydronephrosis were identified with malignant ovarian neoplasm and pelvic metastasis. 4. Accurate ultrasonographic diagnosis was made in 88 cases (83.7%) and it may be improved with clinical history of the mass in question.