... proliferation by Ki-67 immunostaining was low The tumor was diagnosed as a primary malignant gastrointestinal stromal tumor with high risk The surgical margins of the intestinal specimen were negative ... Varras M, Tsikini A, Polyzos D, Samara Ch, Akrivis Ch: Internal hemorrhage caused by a twisted malignant ovarian dysgerminoma: ultrasonographic findings of a rare case and review of the literature ... Z, Csapo Z, Szabo I, Papay J, Szabo J, Papp Z: Large gastrointestinal stromal tumor presenting as an ovarian tumor A case report J Reprod Med 2003, 48:655-8 30 Morimura Y, Yamashita N, Koyama N,...