Intrathoracic Duplication of the Foregut.

Intrathoracic foregut duplications are amongst the less common cysts and tumours which occur in the mediastinum. The incidence of mediastinal lesions found in a relatively static population of 1,500,000 in the south-east region of Scotland (le Roux, 1959; 1960a and b; 1961a and b) is shown in Table I. In addition to the 17 lesions indisputably of thymic origin, in 19 patients lymphomata were thought also to be of thymic origin. The

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