Costello syndrome is characterized by postnatal growth deficiency, mental r
etardation, curly hair, coarse characteristic face, and loose skin of hands
and feet. Patients with this syndrome have a high incidence of cardiac inv
olvement, including arrhythmia, atrial septal defect, and hypertrophic card
iomyopathy. We report a 16-year-old adolescent female with Costello syndrom
e who presents with hypercalciuria and urolithiasis.