Background: Prenatal diagnosis of fetal megacystis particularly in the first trimester requires assessement of pronostic and aetiologycal criteria.
Aim: Report a new case.
Case: we report a case of severe megacystis in female fetus diagnosed at 23 weeks of gestation. There are no other associated ultrasound findings. Fetal karyotyping was normal (46XX). Termination of pregnancy for medical indications was realised because of progressive enlargement of the fetal bladder. Post-mortem examination shown megacystis-microcolon-intestinal hypoperistalsis syndrome.
Conclusion: Fetal megacystis is a severe condition when diagnosed early in pregnancy. Ultrasonography follow-up and fetal karyotyping are important to evaluate prognosis.