Transperineal radiofrequency interstitial tumor ablation (RITA) of the prostate.

The purpose of this study was to investigate the safety and feasibility of radiofrequency interstitial tumor ablation (RITA) in localized prostate cancer (PCa) and to assess the predictability of the lesions obtained. In 10 patients with localized PCa (mean age 70.4 years), a total of 21 marker lesions were induced under general (n = 3), spinal (n = 4), or local anesthesia only (n = 3). Radiofrequency energy was delivered transperineally under transrectal ultrasound (TRUS) guidance. Radical prostatectomy was performed in all patients 1-7 days after RITA. The findings of intraoperative TRUS and histologic examination of the specimen were correlated. Lesions 2 x 2 x 2 cm were targeted. Postoperatively, patients were catheterized for an average of 1.8 days (range 1-3). Average lesion diameters defined by coagulative necrosis at histologic examination were 2.20 +/- 0.23 x 2.10 +/- 0.31 x 2.38 +/- 0.14 cm (average volume 5.86 +/- 1.63 cm3). Lesions were well defined and did not extend beyond the prostatic capsule. No complications (e.g., rectal wall injury) were noted. RITA-induced lesions were safe, feasible, technically simple, and resulted in lesions well predictable in size and location. On histologic examination, well-defined areas of coagulative necrosis were documented. No damage to the periprostatic tissue was noted. The procedure can be performed with spinal or local anesthesia only.