Unusual Collision Tumor of Ovary: Endometrioid Adenocarcinom
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Collision tumors represent the coexistence of 2 histologically distinct tumors adjacent to one another in the same organ, without admixture of the components of the tumors.Although uncommon, they have been described in almost all major organs, with a variety of component pathologic features. The majority are diagnosed postoperatively after histologic examination. The origin of these tumors has been debated. It is proposed that collision tumors could arise from 2 different cell lines growing at the same time side by side or a chance occurrence of 2 tumors in the same organ. The other commonly held view is the origin from a common precursor pluripotent stem cell. Cancer is considered to be a disease of the stem cell, and given the plasticity of the stem cell to differentiate this theory is made more plausible. Ovarian collision tumors are rare. We report a case of collision tumor of the ovary composed of teratoma and endometrioid adenocarcinoma.....

http://www.sciencedirect.com/science/article/pii/S1941439011000341
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