Introduction : Commonly ovarian masses are undoubtedly of benign nature during the reproductive years, often presenting with abdominal distention, pain, discomfort, or symptoms of hormonal imbalance (if tumor is hormonally active). Malignant change is seen in 1 in 15 young individuals that maybe associated with bilaterality, solid areas and associated ascites. It notoriously mimics acute abdomen when it undergoes torsion, bleeding, or rupture of the cyst. Presenting here a case of massive ovarian edema, a rare cause of ovarian mass. Case : 19 year unmarried girl was referred for evaluation of ascites with enlarged right ovary and acute renal failure.