a struma ovarii associated with pseudo-meigs’ syndrome is misdiagnosed as advanced ovarian cancer: a case report

Introduction: a struma ovarii is a benign monodermal teratoma, composed of mature thyroid tissue. the presentation of this disease with pseudo-meigs’ syndrome [characterized by ascites, pleural effusions, and elevated cancer antigen-125 (ca-125) levels] may result in an advanced ovarian cancer misdiagnosis. case presentation: the patient was a 54-year-old woman with dyspnea, abdominal distention, and pseudo-meigs’ syndrome. she had a final diagnosis of struma ovarii, misdiagnosed as advanced ovarian cancer. she is currently asymptomatic (after surgery) and has a normal ca-125 level. conclusions: the preoperative diagnosis of struma ovarii is difficult, and if it presents with pseudo-meigs’ syndrome, it may be initially misdiagnosed as advanced ovarian cancer. using the frozen-section procedure, unnecessary extensive surgeries can be prevented.