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Indeed, RTB tract seeding has not been identified in several large retrospective case series examining outcomes following RTB[6], [7], [8], [9] or in a systematic review of the topic,[10] although it is not clear whether biopsy tract features were identified histologically in the cases included in these studies. Only 48% of respondents had specific criteria for identifying biopsy tract features (including a documented history of prior RTB, the presence of haemorrhage or haemosiderin and a linear distribution of tumour). Tumour seeding in the tract of percutaneous renal tumour biopsy: a report on seven cases from a UK tertiary referral centre. [Extracted from the article]