👉 Lobing is a medical condition that refers to the abnormal development of extra-uterine structures in the female reproductive system. It can occur at any stage of pregnancy, but it is most commonly seen during early pregnancy when the fallopian tubes are still developing and forming. During pregnancy, the fallopian tubes become more developed and lined with endometrial tissue. As these tissues develop, they may push against other structures in the uterus, including the cervix and the uterine lining