Clear cell tumour
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Clear cell tumours are part of the surface epithelial-stromal tumour group of ovarian carcinomas, accounting for 6% of cases. Benign and borderline variants are rare. Typically, they are cystic neoplasms with polypoid masses that protrude into the cyst.
On microscopic examination, they are composed of cells with clear cytoplasm (that contains glycogen) and hob nail cells (from which the glycogen has been secreted). The pattern may be glandular, papillary or solid.