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A pulmonary hematoma is a collection of blood within the tissue of the lung. It may result when a pulmonary laceration fills with blood.〔 A lung laceration filled with air is called a pneumatocele.〔 In some cases, both pneumatoceles and hematomas exist in the same injured lung.〔 〕 Pulmonary hematomas take longer to heal than simple pneumatoceles and commonly leave the lungs scarred.〔 〕 A pulmonary contusion is another cause of bleeding within the lung tissue, but these result from microhemorrhages, multiple small bleeds, and the bleeding is not a discrete mass but rather occurs within the lung tissue. An indication of more severe damage to the lung than pulmonary contusion, a hematoma also takes longer to clear.〔 〕 Unlike contusions, hematomas do not usually interfere with gas exchange in the lung, but they do increase the risk of infection and abscess formation.〔 〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pulmonary hematoma」の詳細全文を読む スポンサード リンク
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