A case of resected pectoralis minor muscle metastasis from primary lung cancer

Abstract

Skeletal muscle metastasis of cancer is very rare, and no cure has been established. We report a patient with an excised pectoralis minor muscle lesion that showed abnormal uptake on FDG-PET before surgery. The lesion was a metastasis of lung cancer. The case was a 72-year-old man. An unusual shadow was pointed out in the right lower lung field on a radiograph of the chest during a lung cancer medical checkup in June 2010, and FDG-PET revealed abnormal uptake in the right lower lobe and left pectoralis minor muscle. The lesion of the pectoralis minor muscle was diagnosed as inflammatory, and then thoracoscopic right lower lobectomy, systematic nodal dissection, and resection of the lesion of the left pectoralis minor muscle by cT2aN0M0 IB were performed. The tumor of the right lower lobe was squamous cell carcinoma, and the tumor of the pectoralis minor muscle was also squamous cell carcinoma, and it was diagnosed as metastasis of lung cancer. We performed pT2aN0M1b IV, postoperative chemotherapy (CBDCA+PTX), and radiotherapy (50 Gy).