title: Empyema necessitatis.
mesh_terms: D003937:Diagnosis, Differential; D004653:Empyema / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000209:etiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D011008:Pneumococcal Infections / Q000175:diagnosis / Q000000981:diagnostic imaging; D011014:Pneumonia / Q000150:complications; D011859:Radiography; D013183:Sputum / Q000382:microbiology; D013296:Streptococcus pneumoniae / Q000302:isolation & purification; D013899:Thoracic Neoplasms / Q000175:diagnosis