Abstract
Müllerian adenosarcoma is an uncommon biphasic malignant tumor most often occurring in the uterine corpus and derived from native surface endometrium. We report a case of intramural uterine adenosarcoma arising in association with adenomyosis, in the absence of tumor involving the surface endometrium. This is an extremely rare phenomenon, with only 8 other published cases of uterine corpus adenosarcoma in the absence of surface endometrial involvement, 5 originating in adenomyosis and 3 in adenomyomas. We review these cases. The current FIGO staging system for uterine adenosarcoma assumes origin from the surface endometrium and does not address the rare occurrence of intramural tumors without a surface endometrial component. Such tumors are problematic to stage and could potentially be overtreated, particularly if there is deep myometrial involvement.
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