Endoanal ultrasound

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| name = Endoanal ultrasound

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|purpose = images structures of anal canal

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Endoanal ultrasound is a type of medical investigation which uses ultrasonography to show images of the structures of the anal canal.{{cite book|last1=Santoro|first1=Giulio A.|last2=Falco|first2=Giuseppe Di|title=Atlas of Endoanal and Endorectal Ultrasonography: Staging and Treatment Options for Anorectal Cancer|date=2012|publisher=Springer Science & Business Media|isbn=9788847021297|url=https://books.google.com/books?id=L5XcBQAAQBAJ&q=Endoanal+ultrasound|access-date=23 November 2017|language=en}} It is used in the investigation of some anorectal symptoms, e.g. fecal incontinence or obstructed defecation.{{cite book|last1=Zimmern|first1=Philippe E.|last2=Haab|first2=Francois|last3=Chapple|first3=Christopher R.|title=Vaginal Surgery for Incontinence and Prolapse|date=2007|publisher=Springer Science & Business Media|isbn=9781846283468|page=160|url=https://books.google.com/books?id=y5cYRhGJsOsC&q=Endoanal+ultrasound|access-date=23 November 2017|language=en}}

Endorectal ultrasound is a similar investigation but the ultrasound probe is used to image the rectum and surrounding tissues. It is used to image lesions in the rectum, for example a tumor caused by colorectal cancer and to assess local lymph node involvement.{{cite journal |last1=Maksim |first1=R |last2=Buczyńska |first2=A |last3=Sidorkiewicz |first3=I |last4=Krętowski |first4=AJ |last5=Sierko |first5=E |title=Imaging and Metabolic Diagnostic Methods in the Stage Assessment of Rectal Cancer. |journal=Cancers |date=16 July 2024 |volume=16 |issue=14 |page=2553 |doi=10.3390/cancers16142553 |doi-access=free |pmid=39061192|pmc=11275086 }}{{cite journal |last1=Opara |first1=CO |last2=Khan |first2=FY |last3=Kabiraj |first3=DG |last4=Kauser |first4=H |last5=Palakeel |first5=JJ |last6=Ali |first6=M |last7=Chaduvula |first7=P |last8=Chhabra |first8=S |last9=Lamsal Lamichhane |first9=S |last10=Ramesh |first10=V |last11=Mohammed |first11=L |title=The Value of Magnetic Resonance Imaging and Endorectal Ultrasound for the Accurate Preoperative T-staging of Rectal Cancer. |journal=Cureus |date=October 2022 |volume=14 |issue=10 |pages=e30499 |doi=10.7759/cureus.30499 |doi-access=free |pmid=36415358|pmc=9674932 }}