Perineal ultrasound.
D000328:Adult; D001005:Anus Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D002648:Child; D019160:Endosonography / Q000379:methods*; D005260:Female; D052776:Female Urogenital Diseases / Q000000981:diagnostic imaging* / Q000473:pathology; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008297:Male; D052801:Male Urogenital Diseases / Q000000981:diagnostic imaging* / Q000473:pathology; D009367:Neoplasm Staging; D010388:Pelvis / Q000000981:diagnostic imaging*; D010502:Perineum / Q000000981:diagnostic imaging*; D012003:Rectal Fistula / Q000000981:diagnostic imaging* / Q000473:pathology; D012004:Rectal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D012680:Sensitivity and Specificity; D018615:Ultrasonography, Doppler, Color / Q000379:methods*