Multiple primary bronchogenic carcinomas (MPBCa) are extremely rare. T
he differentiation of a MPBCa from a pulmonary metastasis due to an ex
trathoracic neoplasm is sometimes difficult. We reviewed 324 pathologi
cally proved primary pulmonary carcinomas and found six cases of MPBCa
(1.9%). We herewith present the series and discuss the diagnosis of M
PBCa.