Ana Filipa Geraldo1, Francisco Valente2, Nuno Almeida3, Joana Nunes3. 1. Department of Radiology, Neuroradiology unit, CHVNG/E- Centro Hospitalar Vila Nova de Gaia/Espinho, Rua Conceição Fernandes, 4434-502, Vila Nova de Gaia, Portugal. anafilipageraldo@gmail.com. 2. Department of Gynecology-Obstetrics, Prenatal Diagnosis unit, CHVNG/E- Centro Hospitalar Vila Nova de Gaia/Espinho, Vila Nova de Gaia, Portugal. 3. Department of Radiology, Neuroradiology unit, CHVNG/E- Centro Hospitalar Vila Nova de Gaia/Espinho, Rua Conceição Fernandes, 4434-502, Vila Nova de Gaia, Portugal.