Repeated Occurrence of Second Primary Lung Cancer at Different Sites in Trachea A Case Report

摘要

Multiple or second primary lung cancers can develop at any sites in the lung with same or different histologic types, synchronously and/ or metachronously. In case of metachronous occurrence of the second primary lung cancer, it is easy to confuse with the primary lung cancer as a recurrence of precedent lung malignancy treated successfully or metastasis. Previous reports have demonstrated that majority of the second primary lung malignancies have same histologic types regardless of their developing time and location. However, the repeated occurrence of the second primary lung malignancy, in particular with the different histologic features, is a very rare condition.