The management for ovarian dysgerminoma is different from those of other ovarian tumors, making accurate diagnosis crucial for patient care. We report a case of 9 year old girl who presented with abdominal distension. Examination revealed a huge palpable intra-abdominal mass. Plain X ray abdomen showed a large homogenous mass filling the mid part of the abdomen and causing displacement of bowel loops laterally. Abdominal sonography showed a large heterogenous lobulated abdominal mass reaching up to the pelvic brim. CECT abdomen showed a large well defined lobulated heterogeneously enhancing mass of 59-61 HU occupying most of the mid part of abdomen and reaching up to the pelvic brim. It showed multiple areas of necrosis with few small specks of calcification. The mass was removed after laparotomy under general anesthesia. Finally, after histopathological examination with raised ß-human chorionic gonadotropin (ß-hCG) levels, the diagnosis of ovarian germ cell tumor (Dysgerminoma) was made.