Patient with perianal pain. Referred for ultrasound.
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Transrectal ultrasound study shows:
Approximately 16 x 15 x 12 mm sized collection with echoes at 6 o'clock to anal canal, probably an abscess.
Tract is directed cranially for 13 mm in length.
It communicates with the anal canal at 6 o'clock.
An abscess is a focal confined collection of suppurative inflammatory material.