OP31.05: Ultrasound appearance of decidualised deep endometriosis during pregnancy

To describe Ultrasound (US) characteristics of three cases of decidualised ectopic implants of endometriosis during pregnancy. Between 2014 and 2017 we collected three pregnant patients in which the presence of hypoechoic peritoneal tissue in addition to decidualised endometriomas was described on US. Those patients were followed up during and after pregnancy with US. MRI was performed during pregnancy in all cases. The age of the patients was 29, 33 and 33 years respectively. The diagnosis was made at 16th, 15th and 14th weeks of gestation respectively. The first patient had a spontaneous delivery at 40th weeks, the second patient incurred in intrauterine fetal death at 24th weeks, and the last one is currently pregnant. No patient underwent surgery during pregnancy. On US examination, the implants appeared richly vascularised at colour Doppler, and they were quite swollen with smooth margins on dynamic evaluation. In all cases MRI, which was performed between 16th and 21st weeks of gestation, confirmed decidualised endometriomas and detected peritoneal nodules in two cases. After termination of pregnancy, in the first case the nodule disappeared, whereas in the second case the persistent nodule was smaller and not vascularised, with irregular margins. Supporting information can be found in the online version of this abstract Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.