[Pyourachal cyst. A diagnosis to keep in mind].

Urachal conditions are relatively exceptional, cystic formations being the most commonly reported. Urachal cysts remain silent and are not diagnosed except for the presence of associated complications such as: infection, lithiasis, re-permeabilization and malignant degeneration. This paper presents one patient with an infected urachal cyst (pyourachal) which required surgical exeresis. A literature revision is made of the clinical, diagnostic and therapeutic aspects. Emphasis is made on the relevance of a high index of suspicion considering its small incidence, the absence of specific clinical sings and the possibility of mimicking different abdominal pictures. Also the usefulness of ultrasound and computerized axial tomography in the diagnosis, and the need for surgical exeresis, including a vesical cup rim, are emphasised.