To clarify prognostic factors for metastatic colorectal cancer to the lung after pulmonary reseciton, we heve reviewed the clinical courses of 58 patients who underwent surgery in Kurume University hospital between 1978 and 2000. The cumalative 5-year survival rate was 34%. Multivariate analysis indicated that the presence of hilar and/or mediastinal lymph node metastases, the presence of extrapul-monary metastases before or at the thoracotomy, and tumor size larger than or equal to 30mm were independent prognostic factars. Especially, the former two of the three factors described above were determinant. Eleven patients underwent repeated pulmonary resection for isolated lung recurrence. Five patients are still alive, including a patient surviving for the longest of 120 months. The survival rates in these 11 patients were 63% at 3 years and 24% at 5 years after the second pulmonary operation, comparing favorably with the survival rate in those who underwent primary pulmonary resection. The median survival was 37 months. Repeated pulmonary operation for recurrent colorectal metastases to the lung yields comparable results to the first pulmonary operation.