[Large-cell lung carcinoma producing chorionic gonadotropin hormone: the difficulty in its differential diagnosis from choriocarcinoma].

We describe a patient with giant cell carcinoma with ectopic production of chorionic gonadotrophin hormone (CGH). This entity is compared with choriocarcinoma, given that the immunologic, histologic and chemical similarities between the two neoplasms can make their anatomic and pathologic differential diagnosis difficult. Clinical examination, response to treatment and CGH blood levels are the criteria for differentiation.