Uterine inflammatory myofibroblastic tumor with THBS1-INSR fusion.

Uterine inflammatory myofibroblastic tumors (IMTs) are rare and, as in other localisations, they are associated with ALK rearrangements and ALK immunohistochemical expression. They are more frequently found during pregnancy, and in this context, they show different characteristics compared to other uterine IMTs. Here, we report the case of a uterine IMT discovered during delivery, and being associated with a previously unreported THBS1-INSR fusion.