title: Synchronous dual primary lung carcinomas.
abstract: Synchronous dual primary lung carcinomas were found in 8 of 482 patients with lung cancer, an incidence of 1.6 percent. Of the 8 cases, 7 were unilateral and one bilateral. Three showed dissimilar histologic patterns occurring in combinations of squamous-cell carcinoma and adenocarcinoma. In 5 cases, two separate tumors were noted with identical histologic patterns in combinations of squamous-cell, giant-cell, large-cell, adeno-. and undifferentiated carcinoma. The patients were heavy smokers and this possibly may have been a factor in the development of carcinoma at more than one site.
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis*; D000368:Aged; D001706:Biopsy; D001999:Bronchoscopy; D002277:Carcinoma / Q000175:diagnosis*; D002294:Carcinoma, Squamous Cell / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000175:diagnosis*; D012907:Smoking