[Multiple primary cancer in 1 lung].

The experience gained in the treatment of 29 cases of primary multiple carcinomas of one lung (synchronous--20 and metachronous--9) was analysed. Criteria for diagnosis of primary multiple neoplasms as well as choice of treatment are discussed. Surgical excision of both tumors was performed in 27 cases (synchronous--19 and metachronous--8). Surgery proved to offer considerable advantage in treatment of the lesion.