[Primary mediastinal seminoma (apropos of 2 cases)]

Two cases of primary mediastinal seminoma in patients aged 43 and 37 respectively are reported, with remarks on the pathogenesis, clinical features, diagnosis and treatment of the disease and a review of the literature. The favourable outcome in these two cases after 1 and 7 years respectively was remarkable. Emphasis is laid on the value of thoracotomy for the diagnosis and treatment.