Collision tumor of the ovary

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.

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Article information

rID: 14475
System: Gynaecology
Tag: cases
Synonyms or Alternate Spellings:
  • Collision tumours of the ovary

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