Needle track seeding in renal mass biopsies

Area of Science:

• Urology
• Oncology
• Radiology

Background:

• Needle track seeding is a potential complication of renal mass biopsy.
• Papillary renal cell carcinoma is particularly associated with this complication.
• Factors influencing seeding include needle size and technique.

Purpose of the Study:

• To analyze the incidence and risk factors of needle track seeding in renal mass biopsy.
• To compare the risk of seeding between fine-needle aspiration and core needle biopsy.
• To inform clinical decision-making regarding biopsy techniques.

Main Methods:

• Literature review and analysis of reported cases of needle track seeding.
• Comparison of complication rates between different biopsy methods (FNA vs. core biopsy).
• Identification of associated factors such as tumor type, needle gauge, and use of coaxial sheath.

Main Results:

• Needle track seeding reported in 16 cases, predominantly in papillary renal cell carcinoma.
• Increased risk associated with multiple punctures, large gauge needles (≥20), and lack of a coaxial sheath.
• Fine-needle aspiration shows a significantly lower seeding rate than large core needle biopsy.

Conclusions:

• Needle track seeding is a rare but significant complication, linked to specific patient and procedural factors.
• Fine-needle aspiration is a safer alternative to large core needle biopsy for minimizing seeding risk.
• A risk-based system for interpreting renal mass fine-needle aspiration may improve patient management.