[A rare cause of a posterior mediastinal mass]

[Interest of imaging in tumors benign bone in children]

Benign bone tumors are more common than malignant tumors in pediatrics. The exostosis (ostéchondrome) is the most common. The different imaging techniques are pivotal in the study of tumors including its standard radiography. The aim of this work is to highlight the interest in imaging the diagnostic management of bone benign tumors in children through a retrospective study of 169 patients. All patients were investigated by plain radiography, scanner supplement with multiplanar reconstruction before and after injection of PDC and / or MRI 1. 5 Tesla was performed according to the indication. The average age is 6 years with a slight male predominance. Clinically, the swelling is present in 35% of cases. The pain in 29% of cases. The most common location is the metaphyseal long bone on: Femur: 25% of cases, humerus: 17% of cases, Tibia: 21% of cases. Main Benign tumors are found exostosis (20. 12%), bone cyst (31. 95%) and osteoblastoma (16, 57%). The imagery is used to specify the topography and extension of the lesion in the bone provide arguments in favor of benign and sometimes in favor of the cause of the injury. The only standard radiograph often provides a diagnosis of certainty in some cases.