Needle-tract implantation following US-guided fine-needle aspiration biopsy of transitional cell carcinoma of the bladder, urethra, and prostate

Thomas G. Nyland, Seth T. Wallack, Erik R Wisner

Research output: Contribution to journalArticle

100 Scopus citations


Localized tumor implantation of the ventral abdominal wall was found at 2, 5, and 8 months following percutaneous ultrasound-guided fine-needle aspiration biopsy (FNAB) of transitional carcinoma of the bladder, urethra, or prostate in 3 dogs. To our knowledge this complication has not been reported in dogs following FNAB. Despite the rarity of needle-tract implantation, the potential for this complication with transitional cell carcinomas is apparently not negligible and warrants consideration. We recommend traumatic urethral catheterization to obtain a cytologic diagnosis of potential transitional cell carcinomas of the lower urinary tract or prostate whenever possible until more information becomes available. However, needle-track implantation is so rare that it should not influence the decision to perform a percutaneous FNAB if the urethra cannot be catheterized.

Original languageEnglish (US)
Pages (from-to)50-53
Number of pages4
JournalVeterinary Radiology and Ultrasound
Issue number1
StatePublished - Jan 2002



  • Bladder
  • Canine
  • Fine-needle aspiration biopsy
  • Neoplasia
  • Prostate
  • Transitional cell carcinoma
  • Ultrasonography
  • Urethra

ASJC Scopus subject areas

  • veterinary(all)

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