A 18-year-old man with chromosomal abnormality and type 2 diabetes mellitus was admitted for fever, cough, and sputum. Laboratory findings showed WBC 16, 200/μ
l, CRP 23.4 mg/d
l, PO
2 75.8 mmHg, glu-cose 327 mg/d
l, and HbAic 7.3%. Based on chest computed tomography (CT) findings, we diagnosed lung abscess of the left lower lobe and administered insulin and antibiotics (IPM/CS+CLDM). His respiratory status and laboratory data worsened (WBC 23, 800/μ
l, CRP 31.5 mg/d
l, PO
2 56.8 mmHg) on day 3 and we diagnosed left thoracic empyema based on chest CT findings, and inserted a chest tube. Although he was treated with antibiotics and chest tube drainage for 4 weeks, purulent effusion from the chest tube persisted, so we undertook surgery on day 40. The postoperative clinical course was good, and the chest tube was removed on day 54. Laboratory findings of diabetes also improved (glucose 100 mg/d
l, HbAic 6.2%) at discharge. Smith-Magenis syndrome was finally diagnosed based on the chromosomal abnormality (deletion 17 p 11.2) and characteristic clinical features mental retardation with behavior problems, facial anomalies, and short, broad hands with short fingers.
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