病例:患儿男,16个月,因发热、气急2天于1989年1月19日收住院。患儿为头胎足月顺产、母乳喂养。体检:体温37.8℃、呼吸36次/分、脉搏112次/分;发育正常,营养稍差,呼吸急促,无鼻扇及发绀,咽充血,气管居中,心脏正常,左肺呼吸音减弱,无罗音,腹软,肝在肋下1.0厘米,质软。血红蛋白120g/L,红细胞4.5×12~(12)/L,白细胞7.5×10~9/L,中性分叶核52%,淋巴细胞48%。胸片:左肺中上野见大片状阴影,密度均匀,下缘清楚,阴影与心影重叠,侧位见阴影位于前上纵隔。临床诊断肺 Case: children male, 16 months, due to fever, shortness of breath 2 days in January 19, 1989 admitted to hospital. Children with full-term first-term birth, breastfeeding. Physical examination: body temperature 37.8 ℃, breathing 36 beats / min, pulse 112 beats / min; normal development, nutrition is poor, shortness of breath, no nose fan and cyanosis, pharyngeal congestion, tracheal center, normal heart, left lung breath sounds weakened, no Ronal, abdomen soft, liver 1.0 cm in ribs, soft. 120g / L of hemoglobin, 4.5 × 12-12 / L of erythrocytes, 7.5 × 10-9 / L of leukocytes, 52% of neutral leaf core and 48% of lymphocytes. Chest radiograph: The left lung in Ueno see large shadow, uniform density, the lower edge of the clear shadow overlap with the heart shadow, lateral shadow seen in the anterior superior mediastinum. Clinical diagnosis of lung