A molar pregnancy is an abnormal pregnancy, which results from abnormal fertilization. The molar pregnancy itself is not dangerous, but if left untreated inside of the uterus it will lead to a uterine cancer, called choriocarcinoma. This means that molar pregnancy is also a precancerous condition. https://www.thewomenschoice.com/molar-pregnancy-complete-and-incomplete-mole-choriocarcinoma-risc/