Cranial meningioma co-localised with Langerhans cell histiocytosis

We present a case in which a patient was initially diagnosed and treated for a para-cavernous meningioma with radiotherapy. An accompanying lesion overlying the left frontal convexity was surgically removed several months later to provide a histological diagnosis. Surprisingly, meningioma and Langherhans cell histiocytosis were found in the same lesion.