<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have been diagnosed with Pulmonary langerhans Histiocytosis X. 63 yo white male and have been told my only hope for the future is a lung transplant. My PFT shows 26 lung capacity and my carbon dioxideoxygen exchange last year was 51, this year 41. My doctor expects a continuing degradation and under pressure admitted that I have probably 4 years left. Should I obtain a second opinion? What are my chances of obtaining a lung transplant? Should I even bother to pursue this option?  <response>: Hello, Yes, you should definitely think about lung transplant. In fact, it is the only option of treatment for end-stage Langerhans cell histiocytosis. It is a chronic progressive lung disease. No treatment is available to halt the progression of the disease. Lung transplant is the only hope. So better to consult a transplant surgeon and discuss it. Hope I have answered your query. Let me know if I can assist you further. 