Granular cell myoblastoma in Nigerian Igbos.

Three cases of granular cell myoblastoma occurring in the Igbos of Nigeria are reported. In this ethnic group the tumor has shown several typical features as follows: it is rarely diagnosed preoperatively; it is found more frequently in the oral cavity and breast than in most other sites; and it is in the maxilla of girls that it usually presents congenitally. A unique presentation in this ethnic group occurred in the perineum. The lesion found in this site appears to be the first to be reported in the literature.