Uterine smooth muscle tumors with hyperintense area on T1-weighted images: differentiation between leiomyosarcomas and leiomyomas.
This study aimed to evaluate the differences between uterine LMS and LM demonstrating intratumoral T1 HIA. METHODS: MR imaging was performed in 509 patients with 1,137 uterine smooth muscle tumors [14 LMSs, five smooth muscle tumors of uncertain malignant potential (STUMPs), and 1,118 LMs] which exceeded 3 cm in diameter. LM with red degeneration and lipoleiomyoma were excluded from the study. We retrospectively reviewed the images and assessed T1 HIA within tumors. RESULTS: T1 HIAs were observed in 11/14 (78.6%) LMSs, 0/5 (0%) STUMPs, and 15/1,118 (1.3%) LMs. T1 HIAs were more homogenous (53% vs 0%, p