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¹Kasımpaşa Asker Hastanesi, Nöroşirürji Kliniği, İstanbul, Türkiye
²Kasımapaşa Asker Hastanesi, Patoloji Kliniği, İstanbul, Türkiye Ewing's sarcoma (ES), is a malignant mesenchymal tumor of young adults. Primary cranium ES is a rare entity. The present case is a 31-year-old man with complaint of swelling at the right posterior part of his head for two months. He had been operated at another center for a mass lesion on the proximal part of his right tibia. Preoperative CT imaging showed a lytic lesion with dural attachment that could be an ES. The lesion was totally removed. He is still in follow-up by the oncology and orthopaedic surgery departments and is waiting for a cranioplasty operation. Primary ES cases usually involve the parietal and frontal convexity regions. Primary involvement of the spinal axis is very rare. Radiollogically, ES is a lytic, mixed or sclerotic lesion. Histopathologically it is a malignant mesenchymal primitive neuroectodermal tumor. A differential diagnosis for round cell tumors should be performed. The primary treatment is surgery. The disorder has the highest mortality rate of all bone tumors. Cranial ES should be accepted as a metastasis until proven otherwise. Treatment and follow-up should be handled multimodally. Anahtar Kelimeler : Ewing's sarcoma, Skull, Metastasis