Fortuitous diagnostic of an undifferenciated large cell carcinoma during acardiac operation

A 57 years old man was operated for aortic valve replacement. During the op erational a mediastinal lymph node was biopsed with the results of undiffer entiated large cell carcinoma with neuroendocrine features. Three months af ter surgery the patient died of non-cardiac related reasons, postmorten exa mination was not performed. Although the primary tumor could not be assesse d, probably the lung was the original location. The histological classifica tion of lung cancer is exposed, with special reference in the undifferentia ted large cell type with neuroendocrine feature.