Isolated intracranial Rosai–Dorfman disease: A case report with CT and MR findings

Rosai–Dorfman disease (RDD) is an idiopathic histiocytic proliferation affecting lymph nodes. Isolated intracranial RDD is rare and usually appears as a well-defined, dura-based lesion without lymphadenopathy. The clinical and radiological features of the intracranial RDD are similar with meningioma. Histological examination is the gold standard for a definitive diagnosis. We present the CT, MR and pathological findings of a 17-year-old girl with isolated intracranial RDD, which manifested as an extraaxial avascular mass with adjacent bone erosion.