【正确答案】Mycoplasmal pneumoniae pneumonia 肺炎支原体肺炎 Mycoplasmal pneumoniae pneumonia is a major cause of pneumonia in school-aged children , young adults, as well as in infants. （0.5分）The pathogen is Mycoplasmal pneumoniae. The patients present with fever and severe coughing. （0.5分） And coughing is the most prominent symptom. （0.5分）But the physical signs in lungs are not apparent or absent. Therefore, The radiographic findings are important for the diagnosis of Mycoplasmal pneumoniae pneumonia . （0.5分）