Uterine inversion caused by uterine sarcoma is a rare condition with 12 reported cases to date according to a MEDLINE search. We report two cases of this rare condition. A 71- and a 72-year-old woman presented with uterine sarcomas rapidly extruded into the vagina. In both cases, magnetic resonance imaging (MRI) scans showed U-shaped uterine cavities and the pedicles of these tumors were attached to the uterine fundi. Pathological examination confirmed a leiomyosarcoma and a heterologous carcinosarcoma. Uterine inversion can occur when uterine sarcoma rapidly increases in size and extrudes into the vagina. MRI should be performed in the diagnosis of this rare combination.