[Primary Ewing's sarcoma of the cranial vault. Report of 2 cases].

Primary Ewing sarcoma of the calvarial skull is very rare, found in less than 1% of the cases. Frontal and parietal convexities are the common sites of occurrence. We report two cases of primary Ewing sarcoma of the skull (in 13- and 14-year-old boys. The first tumor involved the right temporal region and exhibited unclear osteolytic appearance on skull x-rays while computed tomography showed an extraaxial enhanced mass and bone sclerosis with spiculated periosteal reaction. In the second case, the tumor was temporoparietal. Plain films demonstrated a large osteolysis and computed tomography revealed extensive bone destruction involving both the inner and outer tables. In both cases, the C scan revealed extraaxial enhanced masses with intracranial and extracranial extension. Radial resection was performed. Adjuvant chemotherapy was given and no recurrence or metastasis has occurred two years later.