3 year old boy with. 3 swelling over the scalp , biopsy of which is proved as langerhans cell histiocytosis. involement of lt optic nerve with loss of vision in that eye also has diabetes insipidus LFT- normal BOnemarrow_normal study peripheral smear- normal study except for iron deficiency anemia. when is chemotheraphy indicated, is their need to emergency radiotheraphy to orbit
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