Does anyone have good treatment methods for childhood eosinophilic granuloma?

Patient's question:

Age
Detailed medical condition and consultation purpose: One year ago, I was admitted to the hospital due to eosinophilic granuloma of the skull. After surgery, I underwent chemotherapy. Now, the skull has recurred. Is there any good treatment method?

Doctor's answer:

Hormone therapy or radiotherapy twice to three times a week, each time 1-1.5GY, or hydroxyurea treatment.