Özet:

Eosinophilic granuloma is a subtype of Langerhans cell histiocytosis and a benign tumor appearing with single or multiple lytic bone lesion. Although the main reason is not certain yet, it is thought to be developed with secondary reaction to immune deficit or inflammation or infection diseases and viral infections might trigger. Leptomeningeal cyst might appear on pediatric age group after separated linear fracture due to head injury if dura mater is also torn. Especially on convexity fractures, dura mater is torn but arachnoid is intact. As a result of swelling brain parenchyma with pulsation, dura mater migrates and brain parenchyma becomes hernia. In this case a five year old person which has a lump showing pulsation after a minor head injury which had happened 4 weeks ago and made us to think of a leptomeningeal cyst and lead us to make an operation but the pathological results are eosinophilic granuloma is represented.

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