Encysted hydrocele of the canal of Nuck
Left inguinal mass. R/o inguinal hernia.
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There is a non-enhanceing fluid collection involving the left inguinal canal (canal of Nuck), without solid components. It is located medially to the iliac and epigastric vessels. A communication is seen posteriorly with the peritoneum. There are no associated herniated bowel loops. The findings are compatible with a hydrocele of the canal of Nuck.
This diagnosis is rare at this age; it is most commonly diagnosed in children. The only differential diagnosis in this case is a iliopsoas bursitis, but since it is located medially to the epigastric/iliac vessels, it excludes this diagnosis. An abscess wouldn't have this appearance.