Abstract #4142

High Intense Myometrial Tumors on T2-Weighted Images: Differentiation with Diffusion-Weighted Imaging and 1H-MR Spectroscopy

Mayumi Takeuchi¹, Kenji Matsuzaki¹, Masafumi Harada², Hiromu Nishitani¹

¹Department of Radiology, University of Tokushima, Tokushima, Japan; ²Department of Medical Imaging, University of Tokushima, Tokushima, Japan

We evaluated 37 myometrial tumors (7 malignant; 30 benign including 6 cellular and 24 degenerated leiomyomas) exhibiting high intensity on T2-WI. Differentiation based on the signal intensity was difficult. The ADCs in malignancies and leiomyomas were 0.79 +/- 0.26 and 1.54 +/- 0.35, respectively (p<0.01). The ADC in cellular leiomyomas was 1.18 +/- 0.16, which was significantly lower than that in degenerated leiomyomas (1.64 +/- 0.32) and higher than that in malignancies. MRS was performed in 4 malignancies and in 9 leiomyomas. High choline peaks were observed in all malignancies, and in one cellular leiomyoma showing rapid growth.