Ovarian collision tumor

Dr Henry Knipe and Dr Yuranga Weerakkody et al.

Ovarian collision tumors are an uncommon ovarian neoplasm where there is co-existence of two adjacent but histologically distinct tumors in an ovary 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.

Article information

rID: 14475
Synonyms or Alternate Spellings:
  • Collision tumours of the ovary

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Cases and figures

  • Case 1: teratoma and mucinous cystadenoma
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