Prenatal management of a major omphalocele by botulinum toxin injection: A case report

Background: Omphalocele is the result of the abnormal interaction between biological/molecular mechanisms and a genetic predisposition during the first twelve weeks of development, where the return of the intestinal loops to the abdominal cavity is disturbed. Muscle relaxation with botulinum toxin A (TxBtA) has been used as an adjuvant postnatal therapy for the repair of complex abdominal wall defects.Case presentation: A female fetus was diagnosed with a giant omphalocele at 14 weeks of gestation. At 34 weeks and 5 days of gestation, 35 units of TxBtA (diluted at 100 units per 10 ml) were injected under ultrasound guidance into each muscle of the left and right sides of the abdominal wall with a 25G spinal needle. The fetus tolerated the procedure well. Two weeks after the injection, the first ultrasound examination was done and revealed a noteworthy change in the shape of the abdominal circumference, with a 50 % decrease in the omphalocele size. The newborn was delivered at 38 weeks and 3 days of gestation. The omphalocele had a maximum diameter of 7 cm. The patient required mechanical ventilation for 24 hours. The reconstruction of the anterior abdominal wall was completed on the fifth day of life using a component separation technique. Feedings were initiated one day after the closure and the patient was discharged home on the 12th day of life. The patient has not experienced any complications at 2 months of follow up. Conclusion: Our case suggests that prenatal muscle relaxation of the abdominal wall with TxBtA could reduce the need for mechanical ventilation, the time on parenteral nutrition, and the overall hospital stay in newborns with giant omphalocele.