Swelling in the inguinal region of a woman may result from a number of conditions. Hydrocele of the canal of Nuck is a rare condition seen in females which is an extension of the peritoneum into the inguinal canal. It may be difficult to make a specific diagnosis based upon the history and physical examination alone. This report describes a symptomatic 44-year-old woman in whom CT and ultrasound were helpful in diagnosing a hydrocele of the canal of Nuck. Through this work, we will present the results of the imaging leading to its positive diagnosis and its characterization.