Congenital Protein C Deficiency with Pulmonary Infarction

: A 45-year-old man was admitted with left chest pain and hemoptysis. Chest CT on admission showed multiple areas of wedge-shaped consolidation in both lung fields. A perfusion lung scintigram showed bilateral deficits in both lungs, whereas a ventilation scintigram was normal. The serum concentration and the functional activity of protein C were 41% and 42%, respectively. The same results were obtained from studies of the patient's mother and two sons, which indicated that this was a case of congenital protein C deficiency with pulmonary infarction.