【上期回顾】青年男性,既往体健,急性发病,表现为发热、咳嗽,血白细胞正常,丙氨酸转氨酶、天冬氨酸转氨酶升高,左下肺炎。发病后血白细胞及血小板进行性下降,骨髓增生性改变,影像学检查提示肺栓塞、脾梗死,易栓因素系列检查均阴性。【析因求证】患者为青年男性,既往体健。此次急性发病,表现为发热、咳嗽,查血白细胞正常,X线胸片考虑左下肺 【Review of the previous issue】 Young men, past physical health, acute onset, manifested as fever, cough, normal white blood cells, alanine aminotransferase, aspartate aminotransferase increased, left lower pneumonia. After the onset of leukocyte and platelet decreased, myeloproliferative changes, imaging studies suggest that pulmonary embolism, splenic infarction, thrombolytic factor series of tests were negative. Factor analysis】 【patients for young men, past physical health. The acute onset, manifested as fever, cough, check the white blood cells normal, chest X-ray consider the lower left lung