Eosinophilic granuloma of the skull associated with epidural haematoma: a case report and review of the literature.

INTRODUCTION: Eosinophilic granuloma (EG), a benign bone lesion, represents a focal form of histiocytosis X. Here, the authors report a case of an extremely rare presentation of a solitary EG of the skull. CASE REPORT: A 9-year-old boy presented with headache and vomiting for 3 days. His examination was unremarkable except for a tender mass in his left occipital region. Radiological studies revealed a huge bilateral epidural haematoma under the occipital bone, extending supratentorially and infratentorially, and a nonenhanced, epidural, soft tissue mass overlying the left transverse sinus. Evacuation of the epidural haematoma was performed and it was noted that the left transverse sinus wall was eroded by the EG at one point with venous oozing. REVIEW OF THE LITERATURE: The acute presentation of a solitary EG of the skull with an epidural haematoma was described in only four cases in the literature. This is the first documented case in terms of the origin of an epidural haematoma.