Uterine tumors resembling ovarian sex-cord tumors (UTROSCT) cause difficulties, both with respect to diagnosis as well as to the nomenclature. They belong to the group of low grade malignant neoplasms and their clinical course likely depends on the percentage of the sex cord-like component. Morphologically, they can be divided into Type I and Type II with less or more than 50% of sex cord-like areas, respectively. Six patients with an age range of 24-63 years underwent the treatment for primary UTROSCT at the Cancer Center and Institute of Oncology in Warsaw, Poland, between 2000 and 2011. In addition to the surgery, four patients were treated with gestagens. Biopsies or excisions from the tumors were examined microscopically and immunohistochemically (IHC). Two cases were classified as Type I and four cases as Type II tumors. The tumor size ranged from 3 to 24 cm. The sex cord component varied from 25-70%. By IHC examination, the sex cord-like component was calretinin-positive, while the stromal component was positive for CD10 and negative for h-caldesmon in all the cases studied. Additionally, PGR positivity was found in all the cases and four tumors were positive for SMA, CKAE1/3 and inhibin. No recurrences were noted in any of the six patients over a 3-14.5 years of follow-up period. A correct subclassification of sarcomas of UTROSCT type is of crucial importance, since most patients with this rare neoplasm respond well to gestagen therapy and have a good prognosis, compared to other uterine stromal sarcomas.