A 68-year-old man underwent ultrasound-guided needle biopsy of a suspicious renal mass. Just two weeks later, a large number of subcutaneous nodules was found in patient's chest-back, neck and axilla. pathology analysis was found to be metastatic subcutaneous nodules, These features suggest that tumor seeding have occurred during the needle biopsy. Despite needle tract seeding is a rare event, this rare complication should be taken into consideration before contemplating its use in a patient.
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