Collision
tumors have been reported in various organs like the
gastrointestinal tract,
lung,
skin, adrenals,
central nervous system,
lymph nodes,
uterus, but are rarely seen in the
ovary. Collision
tumors are two histologically distinct
neoplasms in the same organ without any intermixture between them. Here we present a case of a collision
tumor of the
ovary represented by a
mucinous cystadenoma and
teratoma. It is imperative for a surgical
pathologist to correctly
diagnose the collision
tumor components and differentiate them from mixed
tumors as it
will dictate the appropriate
treatment based on the individual
biological aggressiveness of each component.