Small intrauterine cystic structures cannot exclude gravidity. Ectopic pregnancy and complete gravidity can be excluded, but not partial gravidity. In a normal pregnancy, an early ultrasound will reveal small cystic structures in the uterus, which can be diagnosed as intrauterine when the fetal heart and buds are not yet present. In the case of a complete gravidarium the uterus will be found to be larger than the corresponding gestational week on ultrasound, and there is no gestational sac, so ectopic pregnancy and complete gravidarium can be excluded. However, in the case of partial gravidarium, there may be a fetal or amniotic cavity on ultrasonography. The presence of fetal tissue fetal membranes and fetal red blood cells in this type of gravidarium, especially in the early stages of partial gravidarium pregnancy ultrasonographic signs are usually atypical and can be easily misdiagnosed. Small intrauterine cystic structures may be normal pregnancies or partial gravidarians, and the diagnosis cannot be made directly, but further investigations should be performed to clarify the diagnosis. Human chorionic gonadotropin measurements can be performed, as well as pathologic tests to confirm the diagnosis.