Novel technique for cognitive magnetic resonance imaging‐transperineal ultrasound fusion transperineal prostate biopsy with injection of bubbled jelly into urethra after abdominoperineal excision

INTRODUCTION: Prostate biopsy is commonly performed using a transrectal ultrasound probe through a transrectal or transperineal approach. However, this is not possible for patients without a rectum. CASE PRESENTATION: A 75‐year‐old male was referred to our hospital because of an elevated prostate‐specific antigen and a suspicious prostate lesion (PIRADS 5) in the left peripheral zone. The patient had previously undergone abdominoperineal resection for rectal cancer, which excluded the use of transrectal ultrasound. We describe the use of the transperineal ultrasound‐guided biopsy with cognitive magnetic resonance imaging‐transperineal ultrasound fusion and the utility of the injection of bubbled lidocaine jelly into urethra to improve its visualization. The pathological findings revealed clinically significant cancer with a Gleason score of 5 + 4. CONCLUSION: Cognitive magnetic resonance imaging‐transperineal ultrasound fusion transperineal prostate biopsy with injection of bubbled jelly into urethra is a feasible and practical technique that does not require any specialized equipment.