三角部;菱形野(前立腺下方の)Trapezoid area below prostate(Area trapezoidea infraprostica)
三角部;菱形野(前立腺下方の)【さんかくぶ;りょうけいや(ぜんりつせんかほうの)】 Area visible on ultrasound between the inferior border of the prostate and the anorectal flexure where the prostate and colon are in contact.