Localised Langerhans cells histiocytosis affecting head and neck is: (A) Letterer-Siwe disease, (B) Pulmonary Langerhans cell histiocytosis, (C) Hand-Schuller-Christian disease, (D) Eosinophilic granuloma
Answer is D. d. Eosinophilic granuloma(Ref: Nelson's 20/e p 2484-2489, Ghai 8/e p 620-623)Eosinophilic granuloma: Bone lesions, with no visceral involvement; Localised; affects head and neck