JAZF1 and endometrial stromal tumor: UTROSCTs lack the JAZF1-SUZ12 fusion that is characteristic of endometrial stromal tumors, indicating that these lesions are unlikely to be of endometrial stromal origin.[16] Instead, we confirmed the presence of the characteristic immunohistochemical features of UTROSCT, the absence of morphological features of the endometrial stroma, and the absence of continuity with the endometrium.