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Transrectal endoscopic ultrasonography (TRUS). TRUS was performed to assess the extent of the abscess. TRUS shows normal endoscopic appearance of the rectal mucosa. Internal anal sphincter appears seamless continuity but with a thickness of about 2.2 mm. It was confirmed, in the right posterior-lateral area, the presence of an abscess 30 × 15 mm hypoechoic with hyperechoic images suggesting gas content
