Retroperitoneal leiomyosarcoma mimicking an ovarian tumor diagnosed using a negative ovarian pedicle sign by Koji Mitsuo, MD, Hideki Kaneko, MD, Makoto Tsukamoto, MD, Yuta Asami, MD, Azumi Miyazawa, MD, Keiichi Miyashita, MD, Go Onoda, MD, Hiroshi Yamashita, MD, PhD, Mami Hatano, MD, PhD, Megumi Kamiyama, MD, Shigeo Okuda, MD, PhD

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