Postnatal growth of rhabdomyoma prior to tumor regression.

We report a case of a 1-month-old infant with multiple intracardiac rhabdomyomas. In contrast to the known natural history of rhabdomyomas to show postnatal regression, this patient showed marked tumor progression prior to initiation of tumor regression at 10 months of age. In the absence of pronounced cardiovascular compromise, this finding should serve to encourage continued conservative management of rhabdomyomas despite tumor progression.