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. 2014 Sep 19;40(3):587–594. doi: 10.1007/s00261-014-0243-5

Fig. 4.

Fig. 4

Expert transvaginal ultrasound (ETVUS) images showing endometriosis involving the anterior rectum, appearing as a solid, non-compressible, hypoechoic implant (white arrows, electronic calipers). Unlike routine transvaginal ultrasound, ETVU assesses the rectum and sigmoid for improved sensitivity.