[Pulmonary sequestrations: from radiologic to preoperative diagnosis: 2 cases with review of the literature].

Pulmonary sequestrations are defined by the presence of a non fonctional pulmonary parenchyma with an abnormal vascularisation. Their incidence ranges from 1.1% to 1.8% of all the malformations in the general population. Two types of sequestrations are described: Intralobar sequestrations: the most common, localised within a normal parenchyma. Extralobar sequestrations: totally separate from the lung with their own pleural covering. We report two cases of sequestrations. In the first case, the radioclinical presentation was strongly suggestive of this diagnosis in a 32-year old woman with recurrent hemoptysis, airspace opacity in the left retrocardiac region and a systemic vascularisation of this mass on tomodensitometry. Pathological studies after surgery confirmed the diagnosis of intralobar sequestration type I in the classification of PRYCE. In the second case a thoracoscopy performed on a 14-year-old boy who had a serohematic pleural effusion, revealed a left costodiaphragmatic mass. Surgical removal of this mass confirmed its extralobar pulmonary nature.