Clear cell carcinoma of the ovary is a type of malignant ovarian epithelial tumour.
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They represent ~2-5% of all ovarian carcinomas and ~3.7%-12% of epithelial ovarian neoplasms. The mean age at presentation is ~10 years younger than for other ovarian epithelial tumours (peaks ~55 age of age 6)
Clear cell tumours are thought to arise from the embryonic mesonephros. Macroscopically comprise of a large unilocular cystic mass with protruding solid nodules. These are histologically very similar to clear cell carcinomas of the endometrium, cervix, or vagina.
Clear cell carcinoma may develop in patients with endometriosis (~25% of cases) who develop ovarian cancer and this may be to a ARID1A gene mutation 4.
Common imaging findings in clear cell carcinoma include a unilocular or large cyst with one or more solid nodular protrusions into the cavity.
Typically seen as a large unilocular, mainly cystic, smooth marginated mass with lumen protruding solid portion and high-attenuated cystic portion 5.
Often seen as a cystic ovarian mass with the margin being generally smooth. Solid protrusions are often both round and few in number.
Reported signal characteristics include
- T1: can vary from low to very high (often dependent on haemorrhagic component(s), not a specific feature)
Staging is the same as general ovarian cancer staging
Treatment and prognosis
They are almost always malignant although the majority (75%) of clear cell carcinomas present as stage I disease whose prognosis appears to be better than that of other ovarian cancers of comparable stage. Overall response to chemotherapy in advanced stages are considered poor 3.
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- 2. Jung SE, Lee JM, Rha SE et-al. CT and MR imaging of ovarian tumors with emphasis on differential diagnosis. Radiographics. 22 (6): 1305-25. doi:10.1148/rg.226025033 - Pubmed citation
- 3. Goff BA, Sainz de la cuesta R, Muntz HG et-al. Clear cell carcinoma of the ovary: a distinct histologic type with poor prognosis and resistance to platinum-based chemotherapy in stage III disease. Gynecol. Oncol. 1996;60 (3): 412-7. Gynecol. Oncol. (link) - Pubmed citation
- 4. Nissenblatt M. Endometriosis-associated ovarian carcinomas. N. Engl. J. Med. 2011;364 (5): 482-3. doi:10.1056/NEJMc1012780#SA1 - Pubmed citation
- 5. Choi HJ, Lee JH, Seok lee J et-al. CT findings of clear cell carcinoma of the ovary. J Comput Assist Tomogr. 30 (6): 875-9. doi:10.1097/01.rct.0000220795.45782.1d - Pubmed citation
- 6. Reed N. Rare and Uncommon Gynecological Cancers, A Clinical Guide. Springer. (2010) ISBN:3642134912. Read it at Google Books - Find it at Amazon
- 7. Eurorad teaching files : Case 6607