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[A rare cause of thoracic shadow].

The observation of an massive thoracic opacity at a patient with minimum symptoms, without considerable medical history makes etiologic diagnosis difficult. An uncommon cause is thoracic ectopia of the kidney and a supplementary liver lobe, both in a common mass with fatty tissue and an external fascis, above the diaphragm, with tumor-like appearance. This malformation of kidney and liver is congenital but the diagnosis may be made in adulthood and is useful for further monitoring and prognosis.