Give detailed notes on the following main topic "Approach of patient with organomegaly / lymphadenopathy", under the following topic learning outcomes: 1. Discuss the causes of lymphadenopathy and hepatosplenomegaly 2. Discuss the clinical approach to lymphadenopathy and hepatosplenomegaly presentation 3. Identify the clinical features and complications of common haematological diseases that present with lymphadenopathy and hepatosplenomegaly 4. List relevant investigations in lymphadenopathy and hepatosplenomegaly with justifications 5. Outline the principle of treatment of common causes of lymphadenopathy and hepatosplenomegaly. Use the following references: Davidson's principles and Practice of Medicine 24th Edition, Kumar and Clark Clinical Medicine 10th Edition, MacLeod's Clinical Examination 15th Edition, Harrison's principles of internal medicine 21st Edition, Nicholas J Talley O' Conner Clinical Examination 9th Edition, Malaysia Ministry of Heath Websites, and Malaysian Clinical Practice Guidelines.