<prompt> Most common cause of pleural effusion in HIV patients -Kaposi sarcomaLymphomaP.cariniiMycobacterium tuberculosis  <response>: Pleural effusions are seen in 70 of cases of pulmonary Kaposi sarcoma , a fact that is often helpful in the differential diagnosis. Primary effusion lymphoma PEL, also referred to as body cavity lymphoma, presents with lymphomatous pleural, pericardial, and or peritoneal effusions in the absence of discrete nodal or extranodal masses. Harrisons Principles of internal medicine, 20 th edition, page 1566 