[Ewing sarcoma in a 12-year-old Gabonese boy].

Ewing sarcoma is a primary malignant bone tumor rarely observed in black populations. We report a case of Ewing sarcoma in a 12-year-old boy, manifested by pain in the lower limbs and pelvis, limping while walking, with functional disability and visual disorders developing over a 2-year period, from 2005 through 2007. The child was transferred for care to South Africa where a biopsy bone was taken and analyzed.

[Avascular necrosis of the femoral head in children with sickle cell disease (Libreville, Gabon)].

We present the clinical aspects of avascular osteonecrosis in children with sickle-cell disease and emphasize the need for early detection of this necrosis of the femoral head, which is often nearly or totally asymptomatic. This retrospective descriptive study covers the 10 years from January 1989 through December 1999 and includes 22 homozygous (Hb-SS) children and adolescents with sickle-cell disease, all presenting pain in the hip and/or limping. The sex ratio was 2.