Figure 3.

Sonogram showing important anatomical landmarks which guide accurate central placement of guide wire. Points A and B indicate ischial tuborosities. Dashed curved line indicates the medial borders of the levators on both sides. The star in the center corresponds to the position of the anal dimple.

Pratap et al. BMC Surgery 2007 7:20   doi:10.1186/1471-2482-7-20
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