Pediatric Eosinophilic Granuloma in the Skull after Minor Head Trauma: A Case Report

Corresponding author: Hee Sup Shin Department of Neurosurgery, KyungHee University Hospital at Gangdong, Kyung Hee University School of Medicine, 892 Dongnam-ro, Gangdong-gu, Seoul 05278, Republic of Korea Tel: +82-2-440-6090 Fax: +82-2-440-8404 E-mail: realeponym@hanmail.net Here, we report a case of eosinophilic granuloma (EG) of the skull in a pediatric patient after minor head trauma without hemorrhage or fracture. A 15-year-old boy presented with a soft mass on the left side of his forehead. The mass was 2 cm in size and was associated with tenderness. It had grown rapidly in 1 month. He had been hit by a baseball on the left side of his forehead 9 months before. Cerebral computed tomography revealed a 2-cm-sized mass in the frontal bone region on the left side with a lytic bony defect. This mass was wellenhanced on cerebral magnetic resonance imaging, and the margin was well-demarcated without intracerebral infiltration. The mass was removed surgically. Total excision was performed through craniectomy around the mass, and the bony defect was reconstructed using bone cement. Three years postoperatively, there was no local or distant recurrence. Minor trauma without hemorrhage or fracture can trigger the development of EG. In pediatric patients, clinicians should be aware of a possible association between solitary EG of the skull and minor head trauma.