[Gastric fibroid polyp in a 4-month-old girl with Costello syndrome].

: We describe the case of a 4-month-old girl with a gastric fibroid polyp. This was an occasional radiographic finding, confirmed by sonography and computerized tomography. This very rare benign tumor was surgically removed. The diagnosis of Costello syndrome was based on clinical appearance. This is the first report of a gastric fibroid polyp in Costello syndrome, a genetic disease with a high tumor frequency.