Perianal pain for 1 week.
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There is an abscess around the anal canal from 11 o'clock (around 6 'clock) to 1 o'clock.
There is also an air tract between the abscess and the anal canal at 6 o'clock.
Findings favour horseshoe-shaped perianal abscess.
Surgery revealed communication between the abscess and the anal canal at 6 o'clock.