Benign Anorectal Disorders by Nisar Ahmad Chowdri & Fazl Q. Parray

Author:Nisar Ahmad Chowdri & Fazl Q. Parray
Language: eng
Format: epub
Publisher: Springer India, New Delhi

9.4.3.4 Anal Ultrasound

Endoscopic ultrasound (EUS) is one of the latest additions to the armamentarium for the evaluation of the anal sphincter. EUS maps the defects of the internal and external sphincters. It is the single most important investigation in the management of sphincter injuries. The internal and external anal sphincters are seen as hypoechoic and hyperechoic structures, respectively, in the EUS. The puborectalis muscle is seen as a hyperechoic U-shaped structure. The defect in the sphincter could be demonstrated preoperatively, which helps in planning the incision and repair. EUS cannot be performed if there is anal stenosis. The lack of widespread availability and training is also a limiting factor (Fig. 9.5).

Fig. 9.5Anorectal USG endoscopic ultrasonogram showing the defect in external anal sphincter (Diagram courtesy of Dr. Preveer Rai)

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