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[Extralobar pulmonary sequestration with aberrant lobulation of the lower lobe; report of a case].

An adult case of extralobar pulmonary sequestration with aberrant lobulation of the right lower lobe is reported. A 32-year-old woman admitted to our hospital with a right intrathoracic tumor in the chest computed tomography (CT). Chest CT showed a mass lesion on the right diaphragm of a diameter 5 cm and abnormal fissure of the right lower lobe. Under the diagnosis of pulmonary sequestration without clearly thick vessels, video-assisted thoracoscopic surgery was performed. The mass existed between the right diaphragm and posterior lower lobe with a thin stalk, and the lower lobe had aberrant lobulation. The resected mass was histopathologically diagnosed as extralobar pulmonary sequestration.