Intrapulmonary teratoma 10 years after removal of a mediastinal teratoma in a young man.

Teratoma is a common tumour of the mediastinum but is rarely found in the lung. The twentieth reported case was published in 1975 by Day and Taylor and four cases have been published since.'-5 A rare condition, not previously recorded, was observed by us in a young male patient. He was found to have a mediastinal teratoma, which was followed 10 years later by the growth of an intrapulmonary teratoma.