Struma ovarii associated with Pseudo-Meig's syndrome and high serum level of CA 125; a case report
© Mostaghel et al; licensee BioMed Central Ltd. 2012
Received: 12 October 2011
Accepted: 21 March 2012
Published: 21 March 2012
Struma ovarii is a rare form of ovarian neoplasm in a form of mature teratoma and is composed predominantly of thyroid tissue. In the literature review, there has only been 10 cases of this tumor, associated with ascites and pleural effusion (Meig's Syndrome) and increased CA125 so far. In such cases, the tumor mimics malignant ovarian tumor. In this article, the case of a 72-year-old symptomatic woman with a pelvic mass, pleural and peritoneal effusion and high level of serum CA125 is presented. Cytological evaluation for the pleural fluid was performed. She underwent hysterectomy and bilateral salpingo-oophorectomy. The result of pathologic diagnosis is presented in this paper. The patient was well in postoperative period and paraclinical tests including CA 125 were normal as well.
KeywordsStruma ovarii Meig's syndrome CA125
Struma ovarii is a rare form of ovarian neoplasm derived from germ cells layers in a form of mature teratoma and is composed predominantly of thyroid tissue. The preoperative diagnosis is generally difficult . Although the vast majority of these tumors are benign, they can also mimic malignant ovarian tumors. Elevated tumor markers for a post-menopausal woman presenting with a multilocular adnexal mass, ascites, and pleural effusion can be interpreted as highly suspicious case of malignancy . The diagnosis is usually made postoperatively and by the pathologists. The association of pseudo-Meig's syndrome and elevation of CA125 level to struma ovarii is an extremely rare condition  that makes it difficult to differentiate from malignancies [3, 4]. In some cases, the tumor produces thyroid hormone and in some cases, hypothyroidism is reported after tumor resection .
Her transvaginal ultrasonography showed multilocular cystic-solid mass on her right ovary measuring 53 mm in diameter, with a 6.8 mm internal septae and 19 mm mural nodule. The low-resistant pattern on the right ovarian artery was in favor of malignancy (RI = 0.61). There was also free intraperitoneal fluid in pelvic cavity. The sonographic figure of her mass declared a case of serous cystadenocarcinoma.
CA19-9 = 62.72
CA125 = 607.4
CEA = 1.92
Inhibin A < 0.1
The patient went through operation. Her abdominal cavity had about 700 cc of free fluid sent for cytological examination. The uterine and left ovary was normal. There was a 9 cm-diameter mass on her right ovary with vegetative lesions on its surface that was resected and sent for the frozen section.
The patient recovered normally and went to home on the fifth postoperative day. After three months of surgery, no evidence of ascites and pleural effusion was detected and the serum level of CA 125 was in the normal range (9.3 Units/ml); 12 months following the surgery the CA125 level is 12.5 Units/ml, and there is neither pleural effusion in chest X-ray (Figure 1) nor ascites or mass in abdominopelvic ultrasonography. The patient is healthy and TSH level is 1.6 micIU/ml.
Mature cystic teratomas prevalence is about 20% of all ovarian tumors. Thyroid tissue is observed in 5-15% of dermoid tumors, but in struma ovarii tumor the thyroid proportion should be more than 50% of the tissue . Struma ovarii is a mono-dermal variant of ovarian teratoma, which was first described by Von Klden in 1895 and Gottschalk in 1899 . It contains about 2.7% of ovarian teratomas . It is usually a benign lesion but sometimes, malignant transformation could be observed. Preoperative clinical diagnosis of struma ovarii, is very difficult. Despite containing thyroid tissue, only 5% of struma ovarii have features of hyperthyroidism . Ascites has been reported in one-third of cases. However, the association of ascites and hydrothorax with this tumor is not common . Meigs first described the syndrome consisting of ovarian fibroma/thecoma, with ascites and hydrothorax . Pseudo-Meigs syndrome consists of pleural effusion, ascites, and benign tumors of the ovary other than fibromas.
These benign tumors include the tumors of fallopian tube or uterus, mature teratomas, struma ovarii, and ovarian leiomyomas . The ascitic and pleural fluids in Meigs' and pseudo-Meigs' syndrome are usually serous, but may be serosanguinous and can be either transudative or exudative. In electrophoresis performed on several cases it has been determined that pleural and ascitic fluids were similar in nature. Tumor size, rather than the specific histologic type, is thought to be the important factor in the formation of ascites and accompanying pleural effusion. The origin of the effusions remains obscure, although some mechanisms have been suggested such as active fluid secretion by the tumor or peritoneum, venous and/or lymphatic obstruction, low serum protein, inflammatory products, hormonal stimulation, and tumor torsion . In the literature, very few reports have been published on struma ovarii associated to ascites and high CA125 [1, 4, 9–11].
Other than malignant ovarian epithelial tissue, CA 125 antigen is found on both healthy and malignant cells of mesothelial origin (e.g. peritoneal, pleural, pericardial and endometrial cells) and non-mesothelial cells (e.g. cervical epithelium, amniotic membrane, etc.) . Elevated CA125 is therefore reported in many situations involving these cells, for example ascites or pleural and pericardial effusions. The mechanism of such elevation in CA125 may include infiltration of peritoneum by malignant cells, peritoneal stretching by ascites, low clearance of CA125 by liver in cirrhotic patients, and lymphatic absorption of ascetic fluid full of CA125 antigen. Any condition that can cause ascites or effusions (e.g. cardiac diseases, hepatic failure, infectious processes or malignancies) can raise serum CA125 antigen.
We describe an additional case with struma ovarii associated with pseudo-Meigs syndrome and high level of CA 125. Serum levels of CA-125 can be elevated in Meig's syndrome, but the degree of elevation does not correlate with malignancy . The elevation of CA 125 that may be secondary to the presence of ascites was much higher than that of typically seen with ascites of benign origin.
Association of an ovarian mass with ascites and high CA 125 level in women generally suggests a malignant process. Therefore, the present case with the clinical findings of ascites, hydrothorax, high level of CA 125 and a large pelvic mass in an elderly woman suggested pelvic malignancy before operation. After surgical resection of the tumor and pathologic investigation, the benign nature of the mass became evident and complete remission of the ascites, hydrothorax, and CA125 was obtained after surgery without any further treatment. The patient is on follow-up and now after about 12 months she is symptom free.
Struma ovarii is usually non functional and only 8% of patients present with symptoms and signs of hyperthyroidism, as a result of autonomous activation of the thyroid tissue . At presentation our patient had no findings suggestive of hyperthyroidism and after the operation she is clinically and biochemically euthyroid (TSH = 1.6 micIU/mL). It is worth mentioning that the granulosa-theca cell tumor is probably the most misdiagnosed lesion of the female gonad. According to Emil Novak Ovarian Tumor Registry, lesions misdiagnosed initially in frozen section study as granulosa cell tumors, can be recognized as metastatic carcinomas, teratoid tumors, and poorly differentiated mesothelial tumors . In this case the mass was initially misdiagnosed as granulosa cell tumor but finally the diagnosis of struma ovarii was confirmed.
According to this report, one should know that there are some benign ovarian masses like Struma Ovarii that resemble malignant conditions initially based on their clinical or laboratory aspects and morphological appearances.
In the differential diagnosis of an ovarian mass in a patient presented with ascites, high CA 125 serum and pleural effusions, but with negative cytologic examination we should consider these benign gynecological conditions too.
Written informed consent was obtained from the patient for publication of this Case report and any accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
NM, AE, MF: Department of Obstetrics and Gynecology, Taleghani Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
KZ: Department of pathology, Taleghani Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
- CA 125:
We cordially thank Dr. Yousef Janbaz at pathology department of our hospital for his kindly revising the manuscript critically for important intellectual content and Dr. Marina Pourafkari at Radiology department of our hospital for her kind cooperation in reviewing the imaging studies of the patient.
- Jiang Wei, Xin Lu, Zhu Zhi L, Liu Xi S, Xu Cong J: Struma ovarii associated with pseudo-Meig's Syndrome and elevated serum CA125: a case report and review of literature. J Ovarian Res 2010, 3: 18. 10.1186/1757-2215-3-18PubMed CentralPubMedView ArticleGoogle Scholar
- Mitrou S, Manek S, Kehoe S: Cystic struma ovarii presenting as pseudo-Meigs' syndrome with elevated CA125 levels. A case report and review of the literature. Int J Gynecol Cancer 2008,18(2):372–375. 10.1111/j.1525-1438.2007.00998.xPubMedView ArticleGoogle Scholar
- Loizzi V, Cormio G, Resta L, Fattizzi N, Vicino M, Selvaggi L: Pseudo-Meigs syndrome and elevated CA125 associated with struma ovarii. Gynecol Oncol 2005,97(1):282–284. 10.1016/j.ygyno.2004.12.040PubMedView ArticleGoogle Scholar
- Bokhari A, Rosenfeld GS, Cracchiolo B, Heller DS: Cystic struma ovarii presenting with ascites and an elevated CA-125 level a case report. J Reprod Med 2003,48(1):52–56.PubMedGoogle Scholar
- Willemse PH, Oosterhuis JW, Aalders JG, Piers DA, Sleijfer DT, Vermey A, Doorenbos H: Malignant struma ovarii treated by ovariectomy, thyroidectomy, and 131I administration. Cancer 1987,60(2):178–182. 10.1002/1097-0142(19870715)60:2<178::AID-CNCR2820600210>3.0.CO;2-QPubMedView ArticleGoogle Scholar
- Roth LM, Talerman A: The enigma of struma ovarii. Pathology 2007,39(1):139–146. 10.1080/00313020601123979PubMedView ArticleGoogle Scholar
- Jing (Jeannie) R Chen, Michel E Rivlin (Eds): Struma Ovarii In 2010. [http://emedicine.medscape.com/article/256937-overview]
- Klaus-Dieter Lessnau, Carl V Smith (Eds): Meigs Syndrome In 2009. [http://emedicine.medscape.com/article/255450-overview]
- Long CY, Chen YH, Chen SC, Lee JN, Su JH, Hsu SC: Pseudo-Meigs syndrome and elevated levels of tumor markers associated with benign ovarian tumors-two case reports. Kaohsiung J Med Sci 2001,17(11):582–585.PubMedGoogle Scholar
- Mui MP, Tam KF, Tam FK, Ngan HY: Coexistence of struma ovarii with marked ascites and elevated CA-125 levels: case report and literature review. Arch Gynecol Obstet 2009,279(5):753–757. 10.1007/s00404-008-0794-1PubMedView ArticleGoogle Scholar
- Jotkowitz MW, Gee DC: Unique case of massive ascites, extreme elevation of serum CA 125 tumour marker. Aust N Z J Obstet Gynaecol 1999,33(4):453–454.Google Scholar
- Silberstien LB, Rosenthal AN, Coppack SW, Noonan K, Jacobs IJ: Ascites and a raised serum CA 125-confusing combination. J R Soc Med 2001, 94: 581–582.Google Scholar
- Rana V, Srinivas V, Bandyopadhyay S, Ghosh SK, Singh Y: Bilateral benign non functional struma ovarii with Pseudo-Meigs' syndrom . Indian J Pathol Microbiol 2009, 52: 94–96. 10.4103/0377-4929.44978PubMedView ArticleGoogle Scholar
- Berek J S: Ovarian and Fallopian tube cancer. In Gynecology. Lippincott Williams & Wilkins, 530 Walnut Street Philadelphia, PA 19106 USA; 2007:P1521.Google Scholar
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