IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-10-8-36277 Original Research Paper Study of etiology and clinical profile of Massive Pleural Effusion patients presenting in Department of respiratory medicine (Tertiary care teaching hospital) at Dehradun, Uttarakhand Singh Jangpangi Dr. August 2021 10 8 01 02