High Quality Content by WIKIPEDIA articles! A pneumatocele, or pneumatocyst is a cavity in the lungs filled with air that may result from pulmonary trauma. A pneumatocele results when a lung laceration, a cut or tear in the lung tissue, fills with air. A rupture of a small airway creates the air-filled cavity. Pulmonary lacerations that fill with blood are called pulmonary hematomas. In some cases, both pneumatoceles and hematomas exist in the same injured lung. A pneumatocele can become enlarged, for example when the patient is mechanically ventilated or has acute respiratory distress syndrome, in which case it may not go away for months. Diagnosis can be made using chest X-ray; the lesion shows up as a small, round area filled with air.Computed tomography can give a more detailed understanding of the lesion.Differential diagnoses, other conditions that could cause similar symptoms as pneumatocele, include lung cancer, tuburculosis, and a lung abscess often created by Staphylococcus...

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