“…30,31,53,58 Rarely, CSF cytology will reveal Langerhans cells. 27 As is the case in extracranial LCH, cerebral parenchymal lesions usually respond well to surgical excision, conventional radiation, radiosurgery, and chemotherapy. 15,21,30,31,40,48,53 One patient in our series, who was diagnosed when she was 1 year old with multisystem LCH, developed a large frontotemporal mass 7 years later, which was proven based on biopsy findings to be LCH.…”