A Case of Pleomorphic Carcinoma and Mucoepidermoid Carcinoma Occurring as Synchronous Multiple Primary Lung Cancers

Abstract

Background. Pleomorphic carcinoma (PMC) and mucoepidermoid carcinoma (MEC) of the lung are rare histological types of tumor. We herein describe a case of PMC and MEC occurring as synchronous multiple primary lung cancers. Case. A 74-year-old man was referred to our department because of a double mass in the left lower lobe. The examination of a transbronchial lung biopsy specimen confirmed the presence of non-small cell lung carcinoma (NSCLC). Both lesions were localized in the left lower lobe, and we performed thoracoscopic left lower lobectomy with lymph node dissection (2a-1). The pathological diagnoses were PMC (S⁶, pT3N0M0, Stage IIB) and MEC (S⁹, pT4N0M0, Stage IIIA). The postoperative course was uneventful. He left our hospital 2 weeks after surgery. Conclusion. We described a rare case of simultaneous PMC and MEC. This shows that multiple lung nodules can be synchronous multiple primary lung cancers as well as primary lung cancer and pulmonary metastases.