A Case of Implantation Metastasis after Needle Biopsy for Chest Wall Metastasis of Retroperitoneal Liposarcoma.

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A case of implantation metastasis after needle biopsy for chest wall metastasis of liposarcoma is reported. A 70-year-old female who had undergone excision of retroperitoneal liposarcoma 8 years previously was admitted to our hospital for examination and treatment of a mass growing from the right chest wall into the thoracic cavity. Needle biopsy with an 18 gauge injection needle and a 19 gauge biopsy needle (Chiba University) only revealed it as a soft tissue tumor. Tumorectomy led to a diagnosis of the myxoid type of liposarcoma which could have been a metastasis of retroperitoneal tumor. Eight months after the operation, local recurrence was found along the needle tract in the subcutaneous tissue, the intercostal muscle, and the right lung. Partial resection of the right upper lobe with combined resection of the chest wall was performed. She was followed for a year and 4 months without recurrence.<BR>Cases of needle tract metastasis have been reported to occur in less than 1% of lung cancer cases. This is the first reported case of needle tract metastasis of liposarcoma. Combined resection of the needle tract with tumor may be necessary to prevent this complication if liposarcoma is diagnosed preoperatively.
特定非営利活動法人日本肺癌学会の論文