Anal Pain of an Unusual Cause: Role of Endoanal Ultrasound.

Anal pain is among the most frequent complaints referred in coloproctology clinic. Nevertheless, this symptom may have a great variety of etiopathogenetic causes. This is the first report that highlights the presence of a rare cause of anal pain, originated by ingested seeds. A 65-year-old male had a 4-day history of fever, anal pain, and discharge. A three-dimensional endoanal ultrasound revealed two perianal abscess cavities with central hyperechogenic areas, in the absence of acoustic shadow. The patient underwent examination under epidural anesthesia, where the two cavities were drained endoanally. Two cereal grains (linseed/sunflower seed) were found during the drainage of the abscess. The utilization of endoanal ultrasound in the investigation of perianal pain is a valuable option. In addition, apart from the size and the exact dimensions of abscesses, endoanal ultrasound also permits the clarification even the most remote etiopathogenetic causes of anal pain.