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Keywords:

  • hydrops fetalis;
  • pre-excitation syndrome;
  • rhabdomyoma;
  • supraventricular tachycardia;
  • tuberous sclerosis

Abstract: Rhabdomyomas are not uncommon in infants with tuberous sclerosis. We describe a neonate who presented with hydrops fetalis arising from a tachyarrhythmia during fetal life related to rhabdomyomas. After reversion of the arrhythmia, pre-excitation was noted on an interval electrocardiogram. Following regression of the tumours, the delta wave disappeared with no further arrhythmias noted.