Fine‐needle core and aspiration biopsy. A new method for diagnosis of prostatic carcinoma

Fine‐needle aspiration of the prostate has failed to gain widespread acceptance among pathologists more familiar with histologic sections. The authors aspirated 27 freshly excised radical prostatectomy specimens with needles of varying caliber and type and found a 22‐gauge Turner needle (Cook Incorporated, Bloomington, IN) which obtained large tissue fragments suitable for cell block preparation as well as high quality cytologic specimens. Thirty men with prostate nodules each had 14‐gauge transperineal core biopsy and fine‐needle aspiration. In 20 cases, cytologic smears and cell blocks and core biopsies agreed on a diagnosis: 12 benign and eight carcinoma. Of seven cases that were atypical by cytologic smears, five were benign on cell block and core; one was benign on cell block and carcinoma on core; and one was carcinoma on cell block and core. Three cases with scant specimens and diagnoses of carcinoma by cytologic smears were benign on cell blocks and cores: one contained seminal vesicle on review; one had repeat benign biopsies; and one had three microscopic foci of low‐grade carcinoma in his radical prostatectomy specimen. This fine‐needle aspiration technique provides histologic sections which are especially useful to those gaining experience with cytologic specimens of the prostate. Cases with discordant diagnoses on cell block and cytologic preparations warrant further evaluation.