Uterine tumor resembling ovarian sex cord tumor shows tumor cells with organized sheets, cords and nests that stains positive for calretinin (CALB2), WT1 and inhibin alpha (INHA) whereas inflammatory myofibroblast tumor stains positive for ALK.24,25 Although awareness of histological mimics is important for process diagnosis, priority should always be given to assessment for infiltrative growth, atypia, pleomorphism, mitoses, and necrosis which could warrant consideration of a malignant process (eg, leiomyosarcoma, endometrial stromal sarcoma). This evidence concerns the gene CALB2 and leiomyosarcoma.