May Be Caused by

 Common

Chronic subdural hematoma

Metastasis

Osteomyelitis

Pacchionian granulation

 Uncommon

Arteriovenous malformation of brain surface

Cisterna magna anomaly

Eosinophilic granuloma

Epidermoid

Hemangioma

Langerhans cell histiocytosis

Leptomeningeal cyst

Melanoma of dura

Meningioma

Multiple myeloma

Oligodendroglioma

Porencephalic cyst

Sarcoma of dura

Sinus pericranii