Long-term follow-up in two cases of intracranial Rosai–Dorfman Disease complicated by incomplete resection and recurrence

Background: Although intracranial Rosai–Dorfman disease is a principally benign lymphohistiocytosis, some patients run a relapsing or progressive course. However, reports about long-term follow-up are extremely rare. Case Description: In two patients, initial tumor resection was incomplete or followed by recurrences over 3 years, which finally subsided after application of chemotherapy, and patients remained tumor-free for more than 7 years thereafter. Conclusion: Up to now there is no agreement on how to treat complicated cases of intracranial Rosai–Dorfman disease; our good experience with adjuvant chemotherapy and long-term follow-up will contribute to treatment planning in complicated cases.