Morphological changes of endometriomas during pregnancy and after delivery detected using ultrasound

Three out of four endometriomas undergo morphological changes during pregnancy. Decidualized endometrioma may mimic borderline malignancy, however, changes regress after delivery. Knowing the natural behavior of endometriomas during pregnancy is crucial to reducing the risk of misclassification of endometriomas as malignant masses. Follow-up ultrasound examination after delivery helps to reassure the benign nature of the cyst.