A collision tumor of the ovary is an uncommon ovarian neoplasm where there is co-existence of two adjacent but histologically distinct tumors with no histologic admixture at the interface.
The exact pathogenesis is not well known. They are most commonly composed of ovarian teratoma (typically mature cystic teratoma of the ovary 5) and an ovarian cystadenoma or ovarian cystadenocarcinoma (typically mucinous 5) while other histologic combinations are much less common (e.g. teratoma and granulosa cell tumor, cystadenocarcinoma and sarcoma).
When an ovarian tumor demonstrates imaging findings that cannot be subsumed under one histologic type, especially in cases of ovarian teratoma 1,4, a collision tumor should be considered.
- 1. 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
- 2. Bige O, Demir A, Koyuncuoglu M et-al. Collision tumor: serous cystadenocarcinoma and dermoid cyst in the same ovary. Arch. Gynecol. Obstet. 2009;279 (5): 767-70. doi:10.1007/s00404-008-0781-6 - Pubmed citation
- 3. Okada S, Ohaki Y, Ogura J et-al. Computed tomography and magnetic resonance imaging findings in cases of dermoid cyst coexisting with surface epithelial tumors in the same ovary. J Comput Assist Tomogr. 28 (2): 169-73. J Comput Assist Tomogr (link) - Pubmed citation
- 4. Kim SH, Kim YJ, Park BK et-al. Collision tumors of the ovary associated with teratoma: clues to the correct preoperative diagnosis. J Comput Assist Tomogr. 23 (6): 929-33. J Comput Assist Tomogr (link) - Pubmed citation
- 5. Rha SE, Byun JY, Jung SE et-al. Atypical CT and MRI manifestations of mature ovarian cystic teratomas. AJR Am J Roentgenol. 2004;183 (3): 743-50. AJR Am J Roentgenol (full text) - Pubmed citation