Infected hydrocele of the canal of Nuck. A hydrocele is the result of a failed obliteration of the inguinal part of the processus vaginalis (so-called canal of Nuck).

The surgeon decided to treat conservatively with antibiotics, and the swelling gradually decreased. Follow-up after 1 year showed complete resorption of the hydrocele.

Superadded infection of the hydrocele is most likely the cause of the wall thickening and enhancement in this case; in most cases, hydroceles have thin walls. The hydrocele does not look purely cystic on the T2-images, this might be due to some intraluminal debris caused by the infection.