Traumatic pseudocyst of the lung following blunt trauma to the chest.

Traumatic pseudocysts of the lung are a rare complication following blunt trauma to the chest. Differentiating them from other cystic lesions of the lung is important. Traumatic pseudocysts usually occur in children and young adults who present with haemoptysis and persistent pain. History of trauma and radiological evaluation with a chest radiograph and a CT scan help in making the diagnosis. Follow-up chest radiographs showing resolution of the pseudocyst can confirm thediagnostic confirmation. This is a report of one such patient, a young man who improved after conservative treatment, with spontaneous radiological resolution of the pseudocyst.