Experience with modified Chiba needle in staging of genitourinary tumors.

The features of a new needle used in the percutaneous pelvic node fine-needle aspiration biopsy in 56 patients with urologic neoplasms are described. The side openings on either side of the needle walls and the bevel angle lowered to 15 degrees provide excellent penetration and aspiration ability. Representative specimens were obtained from all patients, and the accuracy of aspiration biopsy results in determining true stage of disease was 94.64 per cent. These data provided sufficient evidence of the efficiency of our needle to recommend it for use in TNM classifications of urologic tumors.