Staging and Follow-up of Anal Canal Neoplasms with 2- and 3-D Ultrasonography
Here we discuss the importance of the three-dimensional ultrasonography in evaluating malignant tumor of the anal canal as it allows quantifying the extent of tumor invasion into the sphincter muscles, adjacent tissues, and rectum, identifying lymph nodes as well. This modality is very useful in evaluating chemoradiotherapy response and selecting safe biopsy sites in case of suspicion of early recurrence.
KeywordsAnal Canal Axial Plane External Anal Sphincter Internal Anal Sphincter Lesion Length
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