We describe the antenatal and intrapartum care of a 21-year-old nulliparous patient with a known prominent Chiari network.At 19 years of age, this patient was referred to cardiologists with symptoms of inappropriate tachycardia in response to exercise and intermittent nocturnal breathlessness. ECHO revealed a large mobile fi lamentous structure in the right atrium, prolapsing through the tricuspid valve. A diagnosis of a prominent Chiari network was made. Aft er a normal exercise stress test, she was discharged from the clinic. No further investigations or follow-up were arranged. Th e patient booked with the maternity department at 11 weeks ' gestation. All baseline observations and investigations were normal. Fetal anomaly scan showed no abnormalities and growth was on the 50th centile. However, given the patient ' s diagnosis of Chiari network, consultant-led care was preferred.A cardiology opinion was sought. No concerns were raised by the department and no special recommendations for pregnancy or delivery were made.Th e pregnancy progressed well. Th e patient presented in spontaneous labour at term and laboured to full dilatation, but aft er failure to deliver following 1 hour of pushing, assisted delivery was required. A live female infant was delivered with Ventouse. Apgars were 9 and 10; weight 3,760 g. Observations remained stable throughout delivery.Th e woman made an uneventful postpartum recovery, and was discharged home the next day with her baby.